Percival Lowell Papers 1876/1916

Percival Lowell Papers, 1876-1916.

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Percival Lowell Papers, 1876-1916.

MS.1



Creator:	Lowell, Percival, 1855-1916
Title:	Percival Lowell Papers
Inclusive Dates:	1876/1916
Quantity:	38 linear ft.
Abstract:	The Percival Lowell Papers contain the publications, research notes and correspondence of the founder of Lowell Observatory. In addition to his work in astronomy, the papers include Lowell's writings from his travels in the Orient and his lectures and writings for the public, which inspired many future scientists and science fiction writers.
Identification:	MS.1
Language:	English
Repository:	Lowell Observatory 1400 West Mars Hill Road Flagstaff, Arizona 86001 (928) 714-7083 E-Mail: archives@lowell.edu

Biographical Note

Percival Lowell was born on March 13, 1855 in Boston, Massachusetts. He studied at Harvard University from 1872-1876 and graduated with a B.A. degree with honors in mathematics. He also received honorary LL.D degrees from Amherst College in 1907 and Clark University in 1909.

Prior to 1883, Lowell devoted himself to business interests. Between 1883 and 1893, Lowell traveled throughout the Far East. He lived in Japan from time to time during this period and wrote several books about his experiences in this area. He also served as the counselor and foreign secretary to the 1883 Special Mission from Korea to the United States, which was the first diplomatic group sent from Korea to any western power. Following this mission, Lowell stayed in Korea as a guest of the government for several months.

Lowell decided to take up observational astronomy in 1893 after hearing that Giovanni Schiaparelli, who had originally discovered the Martian canali (which means 'channels' or 'grooves' in Italian but was mistakenly translated as 'canals' by the English press), was losing his eyesight and would no longer be able to continue his work on Mars. In 1894, after extensive site testing, Lowell established his observatory in Flagstaff, Arizona. The chief goal of the observatory was to study the solar system and especially Mars. Lowell's theory stated that the Martians were trying to keep their planet alive via a worldwide canal network which channeled water from the Martian polar caps to the rest of the planet. He claimed that the canals were clearer at some times of the year because from Earth one saw the vegetation around the canals rather than the water in the canals themselves. Therefore, while water was running through the canals, more vegetation grew around them and they became clearer. Several Martian globes which Lowell illustrated with his findings are contained in the Observatory archives.

Lowell also conducted research on the other planets in our solar system, particularly Jupiter, Saturn, Mercury and Venus. He was deeply involved in a search for the ninth planet (Planet X), whose existence he had predicted mathematically by studying the eccentricities of Uranus's orbit not accounted for by Neptune. Lowell determined the internal constitution of Jupiter and Saturn by observing the movement of their satellites as it was influenced by the mass of the planet. He also sketched the surface markings of Mercury and determined periods of rotation for Mercury and Venus. However, it should be noted that the accuracy of his sketches of Mercury's surface markings were the subject of much dispute in the scientific community. One should also note that some, if not much, of the data used to form the conclusions published under Lowell's name was gathered by his assistants. For example, in "On the Spectrographic Investigation of the Rotation Period of the Planet Venus" (1903), Lowell states that V.M. Slipher had made the spectrographs which allowed for the determination of the rotation period of Venus, and in "The Tores of Saturn" (1908), Lowell states that C.O. Lampland did some of the "micrometric measurements" which were included in the article.

Lowell was also a prolific writer. In addition to his articles and lectures, he published many books: A Korean Coup d'Etat, (1884), Choson, The Land of the Morning Calm (1885), The Soul of the Far East (1888), Noto (1891), Occult Japan (1894), Mars (1895), The Annals of Lowell Observatory (Vol. 1, 1898; Vol. 2, 1900; Vol. 3, 1905), The Solar System (1903), Mars and its Canals (1906), Mars as the Abode of Life (1909), and The Evolution of Worlds (1910).

Percival Lowell died on November 12, 1916 and is buried on Mars Hill.

Scope and Content

The Percival Lowell Papers include Lowell's original research and computations in astronomy, as well as his lectures and writings for the public on both astronomy and the Orient. The papers date from 1876 to 1916 and are divided into eight series: Manuscripts; Unpublished Lectures, Manuscripts and Poems; Working Papers; Outside Interests; Trans-Neptunian Planet--Original Computations; Correspondence; Memorabilia, and Personal.

The Manuscripts series dates from 1886-1916 and includes Lowell's scientific publications for astronomical journals and the manuscripts for his books about astronomy (particuarly Mars) and the Orient.

The Unpublished Lectures, Manuscripts and Poems series dates from 1876-1916 and includes Lowell's popular astronomical lectures to the public, various unpublished manuscripts about astronomy, botany and the Orient, and his (mostly astronomically themed) poetry.

The Working Papers series dates from 1883-1916 and deals with his astronomical research, mainly focusing on Mars (including cartouches and globes), Saturn and Jupiter.

The Outside Interests series deals with the various clubs and societies of which Lowell was a member.

The Trans-Neptunian Planet--Original Computations series dates from 1903-1915 and includes all of Lowell's mathematical calculations used to search for the Planet X he believed was perturbing the orbit of Uranus and Neptune.

The Correspondence series dates from 1876-1916 and includes Lowell's correspondence with his family, other astronomers, observatory staff, and members of the public interested in learning more about astronomy.

The Memorabilia series consists of objects that belonged to Lowell, such as his hat, undershirt, camera, and flask. These items are located in the artifact collection.

The Personal series contains a few of Lowell's personal items and a scrapbook of newspaper clippings about his life and work.

Restrictions

Conditions Governing Access

Please contact the archives to make an appointment before visiting the institution.

Conditions Governing Use

Unpublished and published manuscripts are protected by copyright. Permission to publish, quote, or reproduce must be secured from the repository and the copyright holder.

Administrative Information

Preferred Citation

Percival Lowell Papers, Lowell Observatory Archives

Container List


Series 1) Manuscripts, 1886-1916
Box	Folders
1	1	Missing, Unavailable
1	2	Korea, Choson: The Land of the Morning Calm; A Sketch of Korea; Boston: Tickmor and Co., 1886
1	3	Love Ramblings, 1887
1	4-A	Esoteric Shinto, Handwritten Manuscript, 1893
1	4-B	Esoteric Shinto - Galley Proofs, 1893
1	4-C	Lecture, St. Botolph Club, from Esoteric Shinto, 1893
1	4-D through 4-E	Missing, Unavailable
1	4-F	Esoteric Shinto, 1893
1	5	Mars: Seasonal Changes on the Planet's Surface, 1894-1896
1	6	Mars, Chinese Translation, 1895
1	7	Detection of Venus' Rotation Period and of the Fundamental Physical Features of the Planet's Surface, 1896
1	8	Drawings of Mercury, 1896
1	9	Further Proof of the Rotation Period of Venus, 1897
1	10	Mercury, 1896-1897
1	11	Mercury Reprints, 1896
1	12	Micrometric Measures of the Diameter of Mars Giving Beside the Size and the Ellipticity of the Planet Apparent Evidence of a Twilight Arc, 1895
1	13	The Rotation Period of Venus, 1897
1	14	Venus in the Light of Recent Discussions, 1897
1	15	Determination of the Rotation Period and Surface Character of the Planet Venus, 1897
1	16	Mars, At the Opposition, 1916
Box	Folders
2	1-A	Mars, handwritten copy, 1894
2	1-B	Mars, printed copies from Astronomy and Astro-Physics, 1894
2	2	Description of Mars, Summary, 1894
2	2-A and 2-B	Mars, three printed copies each, 1894
2	3-A	On Martian Longitudes, unbound essay and printed formats, 1895
2	3-B	On Martian Longitudes, three printed copies, 1895
2	4	Mars I. Atmosphere, The Atlantic Monthly, 1895
2	4-A	Mars II. The Water Problem, 1895
2	4-B	Mars III. Canals, 1895
2	4-C	Mars IV. Oases, 1895
2	4-D	Canals of Mars, 1895
2	5	Oliver Wendell Holmes, 1895
2	6	Evidence of a Twilight Arc Upon the Planet Mars, 1895
2	6-A	On the Existence of a Twilight Arc on the Planet Mars, 1895
2	7	Mars, Published in Popular Astronomy, 1896
2	7-A	Mars, Popular Astronomy Reprint, 5 copies, 1894
2	7-B	Mars, Popular Astronomy, one copy, 1894
2	7-C	Mars, Popular Astronomy, 2 copies, 1894
2	7-D	Mars, Popular Astronomy, 3 copies, 1895
2	7-E	Mars, Popular Astronomy, 2 copies, 1896
2	8	Markings in the Syrtis Major, 1896
2	8-A	Markings on the Syrtis Major, Popular Astronomy reprints, 3 copies, 1896-1897
2	9	Preliminary Manuscript, Mars Observations - 1894-1895, 1898
2	9-A	A Trans-Neptunian Planet, 1914
2	10	Atmosphere and its Effect on Astronomical Research, 1897
2	11	On the Climactic Causes of the Removal of the Lowell Observatory to and from Mexico, 1896
2	12	Missing, Unavailable
2	13	Mars: the Flagstaff Photographs, The New England Magazine, reprints, 4 copies, 1895
Box	Folders
3	1	Mars Observations in 1894-1895, 1898
3	2	The Hopes and Aims of the Modern Astronomer, 1898
3	3	Partial Manuscript for Jupiter's Satellites - Annals of Lowell Observatory, 1900
3	4	Comparison of Schiaparelli's Observations of 1886 and Lowell's of 1901, 1900-1901
3	5	Explanation of the Supposed Signals from Mars of December 7 and 8, 1900, 3 copies, 1901
3	5-A	Explanation of the Supposed Signals from Mars, manuscript and published copy, 1900-1901
3	6	Fourth of July Oration, 1901, 1901
3	6-A	Oration, 4th of July (Flagstaff)-1901 Manuscript, 1901
3	7	Expedition for the Ascertaining of the Best Location of Observatories, 1902
3	7-A	A Standard Scale for Telescopic Observations, 3 copies, 1902
3	8	North Polar Rifts and Arctic Canals on Mars, 1902
3	8-A	North Polar Rifts and Arctic Canals on Mars, Popular Astronomy, one copy, 1902
3	9	Memoir of Augustus Lowell manuscripts, three copies, 1902
3	9-A	Augustus Lowell Memoir, 3 copies, and Commemeration Day Address, two copies, 1902
3	10	Areography, 5 copies, 1902
3	10-A	Areography reprint, 3 copies, 1902
3	10-B	Areography, manuscript and two published copies, 1902
3	11	A Standard Scale for Telescopic Observation manuscript, 1902
3	12	Invariable Plane of the Solar System, 1903
3	13	Description of Mars, 1896-1897
3	14	On the Spectrographic Investigation of the Rotation Period of the Planet Venus, three copies, 1903
3	14-B	Rotation of Venus manuscript, 1903
3	15	The Cartouches of Mars, 4 copies, 1903
3	15-A	The Cartouches of the Canals of Mars, 1902-1903 ca.
3	16	Mars on Glacial Epochs, 4 copies, 1900
3	17	Missing, Unavailable
3	18	On the Variable Velocity of zeta Herculis in the Line of Sight, 1902
3	19	The Rotation of Jupiter, three copies, 1903
3	20	Lowell Tells of Canals Indicating Irrigation, newspaper article, 1916
3	21	Martian Intelligence, newspaper article, 1916
3	22	The Far Horizons of Science, newspaper articles, 1916
3	23	Scientists Sure Mars is Inhabited, newspaper article, 1916
3	24	LaPlace Justified, 1913
Box	Folders
4	1	Mars en 1903 a Flagstaff, French article notes, 1903-1904
4	2	On the Capture of Comets by Jupiter, 1903
4	2-A	Mars - Notes for MIT Lectures, 1902
4	2-B	On the Capture of Comets by Jupiter II, 1903-1904 ca.
4	3	Mare Erythraeum, 1904
4	4	Mars Longitude Determinations in 1903, 1904
4	5	Spectrograms on the Rotations of Planets, 1904
4	6	Double Canals and the Separative Powers of Glasses, 1904
4	6-A	Double Canals and the Separative Powers of Glasses, three copies, 1904
4	7	Mars - North Polar Cap, 1904-1905
4	8	Brontes: A Study in Martian Canal Development, 1905
4	8-A	Bronte, a Study in Martian Canal Development, 5 copies, 1905
4	9	A New Method for Spectrographic Testing of Mars' Atmosphere, 1905
4	10	The Canals of Mars Photographed for Issue 21, 1905
4	11	On Kind of Eye Needed for the Detection of Planetary Detail, three copies, 1905
4	11-A	On the Kind of Eye Needed to Detect Planetary Detail drafts, 1905
4	12	Rotation of Mars and Venus, 1905
4	13	Mars, Measurement of North Polar Cap, 1903-1905
4	14	The Canals of Mars Photographic Comments, 1901-1903
4	15	Description of Canals, 1898-1899
4	16	Comparative Charts of the Region Following Delta Ophiuchi, 1905
4	17	First Photographs of the Canals of Mars, Manuscript, 1905
4	17-A	First Photographs of the Canals of Mars, three printed copies, 1906
4	18	Double Canals of Mars in 1903, 1905
4	19	Description of Mars, 1900-1901
4	20	The Canals of Mars, 1907
4	21	The Outlook on Mars, published as "Is Mars Inhabited", 1907
4	21-A	Is Mars Inhabited?, four published copies, 1907
4	22	The Spectra of the Major Planets manuscripts, 1907
4	22-A	The Spectra of the Major Planets, four printed copies, 1908
4	23	The Canals, Optically and Psychologically Considered - A Reply to Professor Newcomb, three printed copies, 1907
4	24	Position of the Axis of Mars, four printed copies, 1905
4	24-A	Position of the Axis of Mars, updated, 1908
4	25	Saturn's Tores, printed copy, 1907
Box	Folders
5	1	Address to Normal School of Flagstaff on Louis Agassiz' 100th birthday, 1907
5	2	Temperature of Mars, 1907
5	2-A	Temperature of Mars: A Determination of the Solar Heat Received, three printed copies, 1907
5	3	A General Method for Evaluating the Surface of the Planets, with Special Reference to Mars, manuscript and three printed copies, 1907
5	3-A	A General Method for Evaluating the Surface of the Planets, with Special Reference to the Temperature of Mars, three printed copies, 1907
5	3-B	A General Method for Evaluating the Surface of the Planets, with Special Reference to Mars, manuscript and workshop, 1907
5	4	Saturn's Rings, 1907
5	5	Mars, Solis Locus Region in 1907, 1907
5	6	The Planet Mars, 1907
5	7	South Polar Cap of Mars, 1907
5	8	North Polar Cap of Mars, 1907
5	9	On A New Device for Sharpening Celestial Photographic Images, 1907
5	10	New Photographs of Mars Taken by the Astronomical Expedition to the Andes and Now First Published, 1907
5	11	The Tores of Saturn, three bound copies, one loose, 1908
5	11-A	The Tores of Saturn, two printed copies, 1908
5	11-B	The Tores of Saturn manuscript, 1908
5	12	On the Velocity with which Meteors Enter the Earth's Atmosphere, one printed copy, 1908
5	12-A	On the Velocity with which Meteors Enter the Earth's Atmosphere, manuscript, 1908
5	13-A	Mr. Campbell's Compliment to the Lowell Observatory and Air and Large Telescopes, 1908
5	13	The Presence of Water Vapor in the Atmosphere of Mars, manuscript/data, 1908
5	13-B	Water-Vapor in the Atmosphere of Mars, two printed copies, one manuscript, 1908
5	14	Inorganic Evolution manuscript, 1909
5	14-A	Inorganic Evolution, one printed copy, 1909
5	15	Meteorites and the Genesis of the Solar System, 1909
5	16	The Plateau of San Francisco Peaks and its Effects on Tree-Life, manuscript, 1909
5	16-A	The Plateau of the San Francisco Peaks and its Effects on Tree-Life Part 1, two printed copies, 1909
5	16-B	The Pleateau of the San Francisco Peaks and its effects on Tree-Life Part 2, two printed copies, 1909
5	17	The Revelation of Evolution, three printed copies, 1909
5	17-A	The Revelation of Evolution, two printed copies, one manuscript, 1909
5	18	Mars as the Abode of Life, syllabus and lectures, 1909
5	18-A	Mars as the Abode of Life, discussion and correspondence about book, two printed copies, 1909
5	19	Planets and their Satellite Systems, two copies, 1909
5	20	Life on Mars, Prof. Lowell's Defence of his Theories, 1910
5	21	Die Marstandale, German news article, 1907
5	22	Disappearance of the South Polar Cap of Mars in 1894, 1903
Box	Folders
6	1	Halley's Comet, letter draft, 1909
6	2	The Planet Venus, lecture at bicentennial of Clark University, 1909
6	2-A	The Planet Venus, two printed copies, 1909
6	3	The Evolution of Worlds, 1909
6	4	Mars in 1909, 1910
6	5	The Markings on Mars as Seen with Small and Large Telescopes, 1910
6	6	Recent Discoveries about Mars and the Martians, 1910
6	7	The Coming Comet newspaper article, 1910
6	7-A	The Coming Comet manuscripts, 1910
6	8	The On-Coming of A Martian Winter manuscript, 1910
6	8-A	The On-Coming of a Martian Winter, one printed copy, 1910
6	9	Les Canaux Nouveaux De La Planete Mars, 1909
6	10	On the Limits of the Oblateness of a Rotating Planet and the Physical Deductions from Them, manuscript, 1910
6	10-A	On the Limits of the Oblateness of a Rotating Planet and the Physical Deductions from Them, three printed copies, 1910
6	10-B	On the Limits of the Oblateness of a Rotating Planet and the Physical Deductions from Them, four printed copies, 1910
6	11	Comets Lecture at Society of Arts and Science Ball, MIT, 1910
6	11-A	Dr. Percival Lowell on Comets, four printed copies, 1910
6	12	The Wisps of Saturn, 1910
6	13	Photographs of Jupiter manuscripts, 1909
6	13-A	Photographs of Jupiter taken at the Lowell Observatory, April, 1909, three printed copies, 1910
6	13-B	Photographs of Jupiter made at the Lowell Observatory, 1909, three printed copies, 1910
6	14	Observations de la Planete Mars a' l'Observatoire Lowell, lecture summary, 1910
6	15	Saturn's Rings manuscript, 1910
6	16	Canali Novae of Mars, 1910
6	17	Motion of Molecules in Tail of Halley's Comet, 1910
6	18	Schiaparelli's Memorial manuscript, 1910
6	18-A	Schiaparelli obituary, three printed copies, 1910
6	19	The New Canals of Mars, four printed copies, 1910
6	19-A	The New Canals of Mars, 1991
6	20	Lowell Observatory Photographs of the Planets, six printed copies, 1910
6	21	Mars, three printed copies of the Monthly Notices of R.A.S., 1910
6	22	Mars, four printed copies of Scientia, 1910
6	23	La Nouvelle Methode de Photographie Planetaire de L'Observatoire Lowell Avec Ses Resultats Pour Mars, Jupiter, et Saturne, eight printed copies, 1910
6	24	Report of the Work at Lowell Observatory, April, 1903, for the Astronomische Gesellshaft, 1903
6	24-A	Saturn's Rings, two printed copies, 1910
6	25	Die Selbstbildnisse der Planeten, one printed copy, 1910
6	25-A	Memoir on a Trans-Neptunian Planet, in Science News-Letter, 1930
6	26	The Evolution of Worlds, Publishing Notes and Instructions, 1909
Box	Folders
7	1	The Hood of a Comet's Head, 1910
7	2	Total Lunar Eclipse, 1910
7	3	The Sun as a Star, five printed copies, 1910
7	3-A	The Sun as a Star, paper read at the American Association for the Advancement of Science, 1910
7	4	Comet's Tail - The Polar Equation of Motion for a Force Directed to the Focus, 1910
7	5	Velocities of Particles in the Tail of Halley's Comet, 1910-1911
7	5-A	Velocities of Particles in the Tail of Halley's Comet, one printed copy, 1910
7	6	On the Action of Planets Upon Neighboring Particles, 1910
7	6-A	On the Action of Planets Upon Neighboring Particles, two printed copies, 1911
7	7	Spectroscopic Proof of the Repulsion by the Sun of Gaseous Molecules in the Tail of Halley's Comet, three printed copies, 1911
7	7-A	Spectroscopic Proof of the Repulsion by the Sun of Gaseous Molecules in the Tail of Halley's Comet, extract and notes, 1911
7	8	The Duration of the Earth, 1911
7	9	Libration and the Asteroids, three printed copies, 1911
7	9-A	Libration and the Asteroids, manuscript, 1911
7	10	The Spectroscopic Discovery of the Rotation Period of Uranus, one printed copy, 1912
7	10-A	Descouverte Spectroscopique de la Periode de Rotation de Uranus, manuscripts , 1912
7	11	The Asteroids, manuscripts, 1912
7	11-A	The Asteroids, three printed copies, 1912
7	12-A	Precession: The Pyramids and Mars, Lecture at Radcliffe College, 1911
7	12-B	Precession: The Pyramids and Mars, manuscripts and two printed copies, 1912
7	13	Photographs of Saturn, 1910
7	14	The Origin of the Planets, 1913
7	14	The Origin of the Planets, three printed copies, 1913
7	15	The Pyramids as an Astronomical Monument, three printed copies, 1913
7	15	The Pyramids as an Astronomical Monument, manuscript, notes, one printed copy, 1913
7	16	Measures of Saturn - Balls, Rings, and Satellites, 1913-1914
7	17	Sur la Desintegration des Cometes, five printed copies, 1912
7	18	Photographs of Saturn and Halley's Comet, newspaper clipping, 1909
7	19	Soul of the East, Chapter two notes, Undated
7	20	White Spots in the Arctic and Subarctic Zones of Mars, 1908
Box	Folders
8	1	Precession of the Martian Equinox, manuscripts, 1914
8	1-A	Precession of the Martian Equinox, one printed copy, 1914
8	2	A New Heavens and a New Earth, 1913-1914
8	3	Oblateness of Uranus, 1915
8	4	Saturne, 1915
8	5	Saturn Memoir, 1915
8	6	Immigration versus the United States, address at Phoenix, AZ, 1916
8	6-A	Immigration versus the United States, three printed copies, 1916
8	7	The Genesis of the Planets, three printed copies, 1916
8	7-A	The Genesis of Planets, lecture at R.A.S., Toronto and one printed copy, 1916
8	8	Our Solar System, lecture to Chicago Academy of Sciences, 1916
8	9	Saturn's Rings, 1915
8	10-A	The Atmosphere of Mars, manuscripts and two written copies, 1916
8	10-B	Atmosphere of Mars, Russian translation, 1924
8	11	Lowell Observation Circular, 1916
8	12	Optical Principles for Large Telescopes and Their Fallacies, 1916
8	13	Chart of Faint Stars Visible at the Lowell Observatory, one printed copy, 1905
8	14	Le Spectre de la Vapeur d'eau Dans l'atmosphere de Mars (Spectra of the Water Vapor in the Atmosphere of Mars), two printed copies, 1916
Box	Folders
9	1-A	Annals of the Lowell Observatory, volume one, Determinations of the Longitudes and Latitudes of Points Upon the Planet's Surface, 1894
9	1-B	Annals of the Lowell Observatory, volume one, chapter four - Changes Observed on the Surface of the Planet, 1898
9	1-C	Annals of the Lowell Observatory, volume one, chapter one, South Polar Cap, 1898
9	2	Measure of the Fifth Satellite of Jupiter, 1915
9	3	Ontake, 1893
9	4-A	Autumnal Frost and the Making of the South Polar Cap, 1911
9	4	Autumnal Frost on Mars (Unpublished), 1911
9	5	Summary of Lowell Bulletins Published 1903 and 1904, 1905
9	6	Evidence of a Twilight Arc upon the Planet Mars, manuscript, 1895
Box	Folders
9-A	1	Mars draft, 1894
9-A	2	Draft of Mars, continued, 1894
9-A	3	Draft of Mars, continued, 1894
9-A	4	Typed Mars drafts, 1894
9-A	5	Lecture Notes on Society Astronomique de France, 1909-1910
9-A	6	The Markings on Venus, 1902
9-A	7	Itinerary of U.S. Western Speaking Tour, 1916
9-A	7-A	Lecture Notes (Binder), 1916
9-A	8	Mars as the Abode of Life, an Account of Manuscripts, 1908
9-A	9	Comparison of the Stars Visible at the Naval Observatory, the Lick Observatory, and the Lowell Observatory, Undated
9-A	10	Eyes and Telescopes, 1905
9-A	11	Great Discoveries and their Reception - Lecture B, 1916
Box	Folders
10	1	Occult Japan, or The Way of the Gods, Lecture One, Undated
10	2	Occult Japan, Lecture Two, Miracles, Undated
10	3	Occult Japan, Lecture Three, Incarnations, Undated
10	4	Occult Japan, Lecture Four, Incarnations II, Undated
10	5	Occult Japan, Lecture Six, the Gohei, Undated
10	6	Occult Japan, Lecture Six Continued, Undated
10	7	Occult Japan, indeterminate lecture, Undated
10	8	Japanese Floriculture, Undated
10	9	Mars and its Canals, affiliations and chapters one and two, Undated
10	10	Mars and its Canals, chapters three and four, Undated
10	11	Mars and its Canals, chapters five and six, Undated
10	12	Mars and its Canals, chapters seven and eight, Undated
10	13	Mars and its Canals, chapters nine and ten, Undated
10	14	Mars and its Canals, chapters eleven and twelve, Undated
10	15	Mars and its Canals, chapters thirteen and fourteen, Undated
10	16	Mars and its Canals, chapters fifteen and sixteen, Undated
10	17	Mars and its Canals, chapters seventeen and eighteen, Undated
10	18	Mars and its Canals, chapters nineteen and twenty, Undated
10	19	Mars and its Canals, chapters twenty-one and twenty-two, Undated
10	20	Mars and its Canals, chapter twenty-three, Undated
10	21	Mars and its Canals, chapters twenty-four and twenty-five, Undated
10	22	Mars and its Canals, chapters twenty-six and twenty-seven, Undated
10	23	Mars and its Canals, chapters twenty-eight and twenty-nine, Undated
10	24	Mars and its Canals, chapters thirty and thirty-one, Undated
10	25	Mars and its Canals, chapter thirty-two, Undated
10	26	Drawings of Mars used in Annals of Lowell Observatory, Undated
10	27	Maps of canals of Mars by other astronomers, Undated
Box	Folders
11	1-7	Lowell Observatory Annals Volumes I-III; original manuscripts (including list of canals) plus acknowledgement of receipts, 1894-1903
Box	Folders
1 Large	1	North Polar Cap of Mars, 1896
1 Large	2	Mercury - Physical Condition and Rotation, 1897
1 Large	2-A	Mercury, one printed copy, 1897
1 Large	3	Mercury in the Light of Recent Discoveries, manuscript, 1897
1 Large	3-A	Mercury in the Light of Recent Discoveries, one printed copy, 1897
1 Large	4	Some of the Double Canals of Mars, manuscript, 1897
1 Large	4-A	Some of the Double Canals of Mars, four printed copies, 1897
1 Large	5	Observations of Mars - 1894-1895, 1898
1 Large	6-A	New Observations of the Planet Mercury, manuscript and one printed copy, 1898
1 Large	6-B	New Observations of the Planet Mercury, manuscript draft, 1898
1 Large	6-C	New Observations of the Planet Mercury, notes, drafts, and one printed copy, 1898
1 Large	6-D	New Observations of the Planet Mercury notes, photos, and diagrams, 1898
1 Large	6-E	New Observations of the Planet Mercury notes, 1898
Box	Folders
2 Large	1	Memoir on Saturn's Rings, three printed copies, 1915
2 Large	2-A	Mars on Glacial Epochs, manuscripts, 1900
2 Large	2-B	Mars on Glacial Epochs manuscripts II, 1900
2 Large	3	Gallery Proofs for Annals of the Lowell Observatory - Refraction in the Atmosphere of Jupiter, 1900
2 Large	4	Double Canals on Mars, observations and two printed copies, 1903
2 Large	5	The Evolution of Life, subtitled: Mars as the Abode of Life, notes and manuscript, 1908
2 Large	6	Venus - Spectrographic Studies, 1909
2 Large	7	Recent Planetary Discoveries on Mars and Saturn, 1909
2 Large	8	Photographs of Jupiter, printed drafts, 1910
2 Large	9	Memoir on a Transneptunian Planet draft and notes, 1914
2 Large	10	Meteors - On the Velocity with Which Meteors Enter the Earth's Atmosphere, 1908
2 Large	11	The Hood of a Comet's Head, five printed copies, 1910
2 Large	12	Recent Sensational Reports on Mars, 1909
2 Large	13	Polar Cap of Mars, one printed copy, 1897
2 Large	14	Set of Six Matted Plates Used in Origin of the Planets, 1913
Box	Folders
3 Large	1	Drawings of Mars, direct from the record book, two printed copies, 1903
3 Large	2	Drawings of Mars, direct from the record book, two printed copies, 1905


Series 2) Unpublished Lectures, Manuscripts, and Poems, 1876-1916
Box	Folders
1U	1	Unpublished poems, 1888-1893 ca.
1U	2	A Sidelight on the Martian Atmosphere, 1894 ca.
1U	3	Other Worlds Than Ours, 1894 ca.
1U	4	Notes Taken from Publications of The Astrophysical Observatory of Potsdam, 1894 ca.
1U	5	Mars, poem, two notebooks and six transcriptions, 1894
1U	6	Amount of Absorption Due to Martian Atmosphere, 1894 ca.
1U	7	On the Theory of Tides, 1896 ca.
1U	8	Modern Mars, 1902 ca.
1U	9	Lecture at Miss Hersey's School on Shinto, the Way of the Gods, and Education, 1902 ca.
1U	10	Welcoming Address to Summer Students at Miss Hersey's Student Association, 1902
1U	11-A	Memorial Day Address, handwritten and typed drafts, 1903
1U	11-B	Commemoration Day Address, typed drafts, 1903
1U	11-C	Commemoration Day Address, three printed copies, 1903
1U	12-A	Means, Methods, and Mistakes in the Study of Planetary Evolution, typed drafts, 1905
1U	12-B	Means, Methods, and Mistakes in the Study of Planetary Evolutions, handwritten drafts, 1905
1U	13	An Ascent of Fuji, Undated
Box	Folders
2U	1	Geology and Areology: Mars and Glacial Epochs, 1907
2U	2	Mars - Non-Natural Features: Canals and Oases, 1907 ca.
2U	3	The Geography of Mars, lecture to National Geographic Society, Washington D.C., 1908
2U	4	Notes, MIT Lectures, 1909
2U	5	The Rotation of Jupiter, 1909
2U	6	Obituary: T.B. Lindsay, 1909
2U	7	Trees of the Different Zones of the San Francisco Region, 1909
2U	8	Prescott lecture: Lowell Observatory and its Work Made Possible only through Arizona, 1909
2U	9	Planetary Evolution, 1909
2U	10	Disintegration of Comets by Planets or the Sun, notebook, 1911
2U	10-A	On the Disintegration of Comets by the Planets or the Sun, typed draft, 1910
2U	11	Halley's Comet in 1910, Lecture to the Boston Scientific Society, 1910
2U	12	Negations of 1909-1910 - Optics in Telescopes and Common Fallacies, 1910
2U	13	Spectrum of Halley's Comet, 1910
2U	14	Discoveries on Halley's Comet, 1910
2U	15	On the Theoretical Rotation Period of Uranus, 1910
2U	16	Address, Harvard Club, 1910
2U	17	Address, Victorian Club - The Portent of Socialism, 1910
2U	18	Mars Axis and Note to Struve about his paper "Uber die Lage der Marsachse und die Konstanten im Marssystem", 1911
2U	19	On Some Fallacies in Observing Mars, 1911
2U	20	Comets - Data sent to go with photos on exhibit at Royal Photographic Society, 1911
2U	21	Sun Spot Zones charts, 1911
2U	22	Small Apertures versus Large ones in the Study of Planetology, Undated
2U	23	Martian Meteorology, Undated
Box	Folders
3U	1	The Newly Discovered Petrified Forest of Arizona, typed draft, 1911
3U	1-A	The Newly Discovered Petrified Forest of Arizona, notebook, 1911
3U	2	Two Stars, lecture delivered at Kingman, 1911
3U	3	Autumn in the Southern Latitudes of Mars, 1911-1915
3U	4	Address of Welcome to Good Roads Association, 1915
3U	5	On the Suggested Movement of the Canals of Mars, 1915
3U	6	Nebular Motion, Melrose Club Lecture, 1915
3U	7	The Inside of Saturn, 1915
3U	8	The Greenwich of Mars, 1915
3U	9	The Canals of Mars, Lecture to the Melrose Club, 1915
3U	10	Lecture, Harvard Club: The Scientific Emancipation of America, 1915
3U	11	Great Discoveries and Their Reception, 1916
3U	12	The Far Horizons of Science, 1916
3U	13	Mars and the Earth, 1916
3U	14	At Giverny, Undated
3U	15	Memorial to Professor J. M. Pierce, Undated
3U	16	Various Non-Scientific Sketches for Novels, Articles, and Photos, Undated
3U	17	Various Not Classified Scientific Papers and Photos, Undated
3U	18	San Francisco Peaks and Surrounding Mountains, Undated
3U	19	Northern Arizona Normal School Address by Percival Lowell, three printed copies, 1903
3U	20	Alvan G. Clark, James Russell Lowell, and Oliver Wendell Holmes obituaries, Undated
3U	21	Essay on the Rank of England as a European Power Between the Death of Elizabeth and the Death of Anne, 1876
3U	22	The Nebular Hypothesis, 1876
3U	23	Phi Beta Kappa Poem, Sakura no Saku, 1889
3U	24	Translations and Comments on Japanese Poetry, Undated
Box	Folders
1U Large	1	The Tides Lecture, 1897
1U Large	2	Address in Prescott, Arizona, on "The Arizona Territory", Undated
1U Large	3	Evolution of the Worlds manuscript, part one, 1909
1U Large	4	Evolution of the Worlds manuscript, part two, 1909
1U Large	5	Evolution of the Worlds manuscript, part three, 1909
1U Large	6	Evolution of the Worlds manuscript, part four, 1909
1U Large	7	Evolution of the Worlds manuscript, part five, 1909
1U Large	8	Evolution of the Worlds manuscript, part six, 1909
1U Large	9	Evolution of the Worlds manuscript, part seven, 1909
1U Large	10	Evolution of the Worlds manuscript, part eight, 1909
1U Large	11	Evolution of the Worlds manuscript, part nine, 1909
1U Large	12	Evolution of the Worlds manuscript, part ten, 1909
1U Large	13	Evolution of the Worlds manuscript, part eleven, 1909
1U Large	14	Evolution of the Worlds manuscript, part twelve, 1909
1U Large	15	Evolution of the Worlds manuscript, part thirteen, 1909
1U Large	16	Evolution of the Worlds manuscript, part fourteen, 1909


Series 3) Working Papers, 1883-1916.
Box	Folders
1	1	Cartouches of Mars, 1896
1	2	Cartouches of Mars, Coordinates, 1903
1	3	Cartouches of Mars, Uncorrected, 1905
1	4	Cartouches of Mars, Computed, 1905
1	5	Cartouches of Mars, Oases, 1905
1	6	Mars - Unsatisfactory Cartouches, 1905
1	7	Cartouches of Mars, 1905-1906
1	8	Mars articles drafts, 1894
1	9	Mars, Canals, and articles on Mars, 1894
1	10	Mars and Annals, 1894
Box	Folders
2	1	Rotation Times of Mars, 1894-1916
2	2	Rotation Period of Mars, 1894-1916
2	3	Longitudes and Latitudes, Mars, 1900-1901
2	4	Translation of Schiaparelli's Observations of Mars, 1883-1884
2	5	Mars, 1903
2	6	Mars - Seeing Periods, 1903-1905
2	7	Mars, First Frost, Insulation Temperature, 1903-1916
2	8	Mars, Notes on the Appearance of the Disk, 1907
2	9	Mars Insolation, 1907
2	10	Mars Calculations, 1911
2	11	Mars Insolation, South Snow - North Snow, 1911-1912
2	12	Rotation Period, 1911-1915
2	13	Mars-Moon Spectra for Water Vapor, 1914
2	14	Mars Insolation, 1916 Investigation, 1916
2	15	Mars - Longitude of Central Meridian, 1916
2	16	Mars Phase Circles, 1916
2	17	Energy Produced During Contraction, Theoretical Mass of Mars, 1905
2	18	Calculations and Papers on Mars, 1916
2	19	Martian Meteorology, (missing), Undated
2	20	Mars Frost, 1908
2	21	Mars Phase Circles, 1911
2	22	Mars Record Book Drawings, 1907-1909
2	23	Alpha and Gamma of Canals on Mars (Longitude and Latitude), 1901-1903
2	24	Data for Drawing Mars Phase Circles, 1909
2	25	Mars Axis and Seasons, 1909
Box	Folders
3	1	Polar Axis Determinations, 1909
3	2	South Polar Cap and North Polar Cap of Mars, 1862-1896
3	3	Latitude of South Snow, 1886-1888
3	4	Mars - Most Probable Value of Right Ascension and Declination of Pole, 1901-1907
3	5	Observations of the Polar Cap of Mars, 1901-1907
3	6	Mars, Right Ascension and Declination of Pole and Vernal Equinox, 1907
3	7	Exact Method for Determination of Corrections to Position Angle of Pole and Coordinates of Polar Cap, C.O. Lampland Data, 1907
3	8	Least Squares and Precision Measures of Correction to Precision Angle of the Pole Coordinates and of the South Polar Cap, 1907
3	8-A	Percival Lowell and C.O. Lampland data for Least Square and Precision Measures, 1907
3	9	Mars Alpha and Gamma of Pole and Vernal Equinox, 1909
3	10	Mars Longitudes and Latitudes, 1896-1897
3	11	Mars Polar Cap Diagrams - South Cap, 1911
3	12	Mars North Cap Bulletin, 1911
3	13	Martian Pole, 1911
3	14	Measures of the South Polar Cap of Mars, 1913
3	15	Mars Polar Cap and Rotation, 1911
3	16	Position of the Axis of Mars, Measures of Rotation of Spirals, 1911
3	17	P.A. and South Polar Cap of Mars, 1912
3	18	Mars Artificial Disc Observations to Calibrate Width of Canals, 1903
3	19	Width of Mars Canals, 1905
3	20	Widths of Double Canals, 1907
3	21	Evidence for Life on Mars, 1907
3	22	Data of P. Lowell and C.O. Lampland for Least Square and Precision Measures of Correction to Position Angle of Pole and Coordinates of South Polar Cap, 1907
3	23	Amount of Water over Irrigated Area, 1908
3	24	Mars Canals, Mean Latitudes, 1909
3	25	Mars - Oases and Canals, 1912-1914
3	26	Latitudes of Markings on Mars, 1909
3	27	Latitudinal Increase of Martian Canals, 1909
3	28	Computations of Longitude of Martian Vernal Equinox, 1909
3	29	LeVerrier Assumed Planet in Neptune, Undated
3	30	Mars Pole, Percival Lowell and E.C. Slipher, 1909
Box	Folders
4	1	Mars Transcriptions, 1900-1901 Section 1, 1900-1901
4	2	Mars Transcriptions, 1900-1901 Section 2, 1900-1901
4	3	Mars Transcriptions, 1903 Section 1, 1903
4	4	Mars Transcriptions, 1903 Section 2, 1903
4	5	Mars Transcriptions, 1905 Section 1, 1905
4	6	Mars Transcriptions, 1905 Section 2, 1905
4	7	Mars Transcriptions, 1907
4	8	Mars Transcriptions, 1909
Box	Folders
5	1	Mars Photos and Drawings, 1896-1901
5	2	Mars Globe Reproductions, 1901
5	3	Venus Drawings, Undated
5	4	Polar Caps of Mars, 1890-1916
5	5	Regions of Mars, 1894-1907
5	6	Latitude of the North Polar Cap of Mars, 1896-1897
5	7	Reproduced Sketches, 1894-1903
5	8	Lowell Observatory Bulletin - Mars Polar Caps, 1907
5	9	Moon in Sky, assorted pictures, 1905-1909
5	10	Mars Phase Circles, 1907
5	11	Mars Detail Drawing by Lowell, 1907
5	12	Martian Markings, notes on reply to Newcomb, 1916
5	13	Mars Drawings, missing, 1907
5	14	Mars - Drawings, Maps, and Photos, 1903
5	15	Wallace's Criticisms of Lowell's Mars, 1908
5	16	Canals of Mars, a Reply to Professor Newcomb, 1907
5	17	Lowell's Comments on Campbell's Comments on the Water Vapor Content on Mars, 1909-1910
5	18	Canals Visibility, 1894-1901
5	19	Visibility of Canals, 1894-1901
5	20	The Thoth and Amenthes (Martian Canals), 1878-1903
5	21	"Depths of" chapters for Mars and Its Canals, 1905
5	22	Mars Canals Observations, 1896-1901
5	23	Mars' First Antarctic Frost, 1911
5	24	Width of the Double Canals of Mars with Different Apertures, 1902-1903
5	25	Width of Double Canals of Mars with Different Apertures - drafts, 1903-1904
Box	Folders
5-A	1	Comments on Lampland's Photographs of the Canals on Mars, Undated
5-A	2	Notebook with astronomical data, Undated
5-A	3	Cloud on Mars' Terminator, 1903
5-A	4	The Sun's Motion as Affecting..., 1900
5-A	5	Schiaparelli's Observations of Mars, 1883-1885
5-A	6	On the Probabilities of Concurrent Evidence, Undated
5-A	7	On Conservativism, Undated
5-A	8	Notes on Origin of Species, 1916
5-A	9	Inhabitation of Mars, 1916
5-A	10	Spectroscopic Impotence, Undated
5-A	11	Mars Canals and Poles plates, Part One, 1894-1895
5-A	12	Mars Canals and Poles plates, Part Two, 1894
5-A	13	Sketches of Mars Canals and Poles, 1894
5-A	14	Coordinates of Mars Canals, Undated
Box	Folders
6	1	Asteroids, 1897
6	2	Asteroids, Commensurability, 1911
6	3	Asteroid Observations by Lowell, 1906-1907
6	4	Telegrams to Lowell regarding asteroid data, 1907
6	5	Asteroids, 1907
6	6	Dynamics of Asteroids, 1912
6	7	Asteroid Theory, 1910-1911
6	8	Asteroid Distribution, 1915-1916
6	9	Jupiter's Third Satellite, 1897
6	10	Measure of Jupiter, 1905
6	11	Jupiter Satellites I and II Computations, 1915
6	12	Jupiter Satellites I and II, 1915
6	13	Jupiter Satellites I and II Differential Refraction, 1915
6	14	Jupiter Satellites I and II Computed Coordinates, 1915
6	15	Jupiter Satellites I and II Least Square Solutions, 1915
6	16	Jupiter Satellites I and II Computed Coordinates, 1915
6	17	Jupiter Satellite I and II Computed Coordinates, additional copies, 1915
6	18	Jupiter (?) From Lowell Observatory to Mr. Johnson O'Connor, Undated
6	19	Lowell Observatory Records, Volume 2, 1894
Box	Folders
7	1	Satellites of Jupiter Least Square Solutions, 1915
7	2	Jupiter Satellite II Computed Coordinates, 1915
7	3	Jupiter Satellite II, 1915
7	4	Jupiter Satellite, 1915
7	5	Jupiter Satellite II, 1915
7	6	Jupiter Satellite V , 1915
7	7	Jupiter - Satellites, 1915
7	8	Jupiter Satellites Differential Refraction, 1915
7	9	Jupiter Satellites I and II, 1915
7	10	Jupiter Satellite I, 1915
7	11	Jupiter Satellite I, 1915
Box	Folders
8	1	Jupiter Satellite I Least Square Solutions, 1915
8	2	Jupiter Satellite I Computed Coordinates, 1915
8	3	Jupiter Satellite I Computed Coordinates Part Two, 1915
8	4	Jupiter Satellite I, 1915
8	5	Jupiter Satellite II, 1915
8	6	Jupiter Satellite I Observed Coordinates, 1915
Box	Folders
9	1	Saturn's Rings - Their Constitution, Undated
9	2	Mimas and Enceladus Measures, 1906
9	3	Photographs of Saturn, 1910
9	4	Saturn Measurements, Mimas and Enceladus, 1911-1915
9	5	Satellites of Saturn - Computed Coordinates, 1912-1914
9	6	Satellites of Saturn Computed Coordinates Part Two, 1912-1915
9	7	Saturn Delta Rings and Satellites, 1912-1915
9	8	Saturn Opposition, 1913
9	9	Saturn and Uranus, 1914
9	10	Saturn - Opposition Photos of Sketches, 1914-1915
9	11	Saturn Measures, 1915
9	12	Saturn Oblateness, Undated
9	13	The Oblateness of Saturn, Computations, Undated
9	14	Saturn, Effect on the Divisions of a Non-Uniform Pull, Undated
9	15	Saturn, B to Ball, C to Ball, 1915
9	16	Saturn's Rings, Undated
9	17	Measures and Divisions of Saturn's Rings, 1915
9	18	Measure of Saturn's Rings, Undated
9	19	Saturn's Rings - Measures reduced from Lowell's notebook and Slipher's notebook, Undated
9	20	Drawings of Saturn and Reproductions, 1916
9	21	Saturn Original Drawing, 1915
Box	Folders
10	1	Mimas and Enceladus Elements (Calculations by Elizabeth Williams on Saturn and Miscellaneous Subjects), 1912-1915
10	2	Mimas and Enceladus Computed Coordinates, Observation Equations, 1912-1916
10	3	Plots for Correcting Mimas Elongation Measurements, 1912-1915
10	4	Saturn: Longitudes of Satellites, 1913-1914
10	5	Measures Mimas and Enceladus, 1915
10	6	Magnitudes of Saturn's Satellites, Undated
10	7	Variability of Saturn's Satellites - Diagrams, 1914
10	8	Satellites of Saturn - Observed Coordinates with Respect to Primary, 1913-1914
10	9	Enlarged Drawing of Saturn, 1909
10	10	Saturn - Enlarged Drawing, 1910
10	11	Data for the Drawing of Saturn, 1912
10	12	Saturn, Enlarged Drawings, Alternative 1912 Version, 1912
10	13	Variability of Brightness of Prints and Drawings of Saturn's Satellites, 1913-1914
10	14	Saturn and Rings (Photographs) and Neptune Diagrams, 1907
10	15	Photos of Saturn Drawings by Lowell, 1915
10	16	Planet X and Transneptunian Planet Plates, 1904
10	17	Planet X Search Documents, 1905-1906
10	18	Planet X Computations, Gaillot and Refined, etc., 1913
10	19	Longitude Perturbation Plots and Calculation for Planet X, Undated
10	20	Planet X Computations and Proofs, 1905-1915
10	21	Mostly Planet X Final Computations and Proof, 1905-1915
10	22	Astronomical Calculations, Undated
10	23	Plots with small scale Planet X plots (not to be used with Transneptunian planet), Undated
10	24	MDL Lectures, Cosmic Physics - Nebulae and photos of nebulae, 1909
10	25	Longitudes of C.M. Mars, Jupiter, Saturn, and Venus, 1900-1907
10	26	Venus, copies of drawings by Lowell and others, 1896-1909
10	27	South Cap of Mars, Saturn and Uranus measurements, 1907
10	28	Satellites and Asteroids Libration, 1885-1910
10	29	Coded Comet Reports with Copy of Codebook, 1911
10	30	Nebulae - Miscellaneous Photos, 1901-1909
10	31	Leonid Meteor Shower, 1898
Box	Folders
11	1	Meteors: Relative Number at Sunrise and at Sunset, Undated
11	2	Commensurate Periods of Planets, 1913
11	3	Notes on Planetary Evolution, 1916
11	4	Celestial Mechanics, 1904-1907
11	5	Miscellaneous Calculations, Rotation of Venus, Undated
11	6	Venus, Miscellaneous measurements, 1903
11	7	Stars, Undated
11	8	Spectrogram Analysis of Uranus, 1910
11	9	"Mercury" (City of Mexico), 1897
11	10	Zodiacal Light Negatives - Records, 1899-1901
11	11	The Effect of Chromatic Abberation in a Refractor, 1907
11	12	Zodiacal Light, Calculations, 1895-1897
11	13	List of Halley's Comet Reproductions, Reproductions sent for Lowell's Lectures, and notes on George Hamilton's paper, 1894-1916
11	14	Differential Equations - Comet Swarms, 1910
11	15	List of Transparencies, Lantern Slides, etc., 1915-1918
Box	Folders
12	1	Early Reports on Astronomical Work in Arizona, Undated
12	2	Printing Micrometer, Undated
12	3	Arrangements of Data for Lowell Annals, Undated
12	4	Solar Activity and Rainfall, Undated
12	5	Our Neighbor's Seasons, Undated
12	6	Notebook - Average Visibility Computations and Polar Cap Measures Reductions, 1896-1905
12	7	Schedule for Lowell's 1916 Lecture Trip, 1916
12	8	Percival Lowell's Last Observation Notes, 1916
Box	Folders
13	1	Mars - Photographs of Artificial Planets, Undated
13	2	Catalogue of Astronomical Photos, Transparencies, Lantern Slides, and Prints on Paper for Sale, 1915
13	3	Pluto Photos and Drawings, 1930
13	4	Publication Drawings of Various Stars and Planets, Undated
13	5	Lagoon Nebula Photos, Undated
13	6	Various old photos, 1894-1917
Box	Folders
14	1	Mars Canal Drawing Negatives, Undated
14	2	Mars Drawing Negative, Undated
14	3	Mars Drawings, Photo Plate, 1909
14	4	Mars Drawing Negative, LCM 60 degrees, Undated
14	5	Mars Drawing negative, 18 inch telescope, Volume 1 Record Book, 1894
14	6	Mars Globe Negtive, 1901
14	7	Mars Drawings, 1894
14	8	Lowell's Mars Maps Negatives, 1896-1905
14	9	Mars Drawing Negative, LCM 330 degrees, Undated
14	10	Mars Plate and Pluto Drawing Comparison, Undated
14	11	Mars Drawing Plates, 1909
14	12	Prints of Mars Globes, 1901-1914
14	13	Mars Drawings by Lowell, 1907
14	14	Mars as Drawn by Lowell, 1894
14	15	Mars Projection Maps, 1896-1905
14	16	Mars Maps (Globes), 1907
14	17-A	Mars Photos and Drawings, 1894-1922
14	17-B	Lampland-Lowell Photo and Drawing Comparison, 1905
14	18	Mars Drawings, 1904-1914
14	19	Mars Sketches, 1911-1912
14	20	Mars Drawings, 1903
14	21	Mars Sketches Photos, 1915-1916
14	22	Mini Mars Photos, 1917
14	23	Missing ,
14	24	Weekly Reports January 17th, 1910 - December 10th, 1910, 1910
14	25	Results of Measurements of Spectrographs of Mars and Moon, 1903
14	26	Schiaparelli Mars Maps, 1877-1886
14	27	Mars Sketches with Coordinates, Undated
14	28	Bright Area in Elysium, 1901-1902
14	29	Mars - Opposition of 1894-1895, 1894-1895
14	30	Diagrams Used in Various Publications, Undated
14	31	Mars Sketch Photos, 1894
Box	Folders
1 Large	1	Key Map of Mars, Undated
1 Large	2	Color Sketch of Canals, 1905
1 Large	2-A	"Solar System" Originals of Cuts, Undated
1 Large	3	Venus Drawings, 1909
1 Large	3-A	Map of Mars on Mercator's Projection, Notes in Red Ink, 1896-1905
1 Large	4	Drawings of Mars, 1905
1 Large	5	Mars Canals and Oases, 1907
1 Large	6	Jupiter Drawings by William Huggins, 1859-1860
1 Large	7	Observation Data, Including Mention of Two Asteroids, Undated
1 Large	8-A	Mars Canal Charts, Undated
1 Large	8-B	Mars Canal Charts, Undated


Series 4) Outside Interests, Undated
Box	Folder
1	1	Clubs and Societies, Undated


Series 5) Trans-Neptunian Planet - Original Computations, 1903-1915
Box	Folders
1	1-10	Computations, 1903-1911
Box	Folders
2	1-14	Preliminary Computations, Undated
Box	Folders
3	1-29	Latitude, 1911-1912
Box	Folders
4	1-22	Neptune Perturbed by trans-Neptunian Planet, 1911-1913
Box	Folders
5	1-18	Longitude, 1913
Box	Folders
6	1-14	Longitude perturbations; a'=40.5 astr. units, 1913-1915
Box	Folders
7	1-21	Longitude; a'=42.5 astr. units, 1913-1914
Box	Folders
8	1-31	Longitude; a'=40.5 astr. units, 1913-1914
Box	Folders
9	1-14	Square solutions perturbation terms S5 and S52; a'=45.0 astr. units, 1914
Box	Folders
10	1-8	Perturbations terms in E'; a'=47.5 astr. units, 1913
Box	Folders
11	1-19	Least square solutions B; a'=47.5 astr. units, 1913-1915
Box	Folders
12	1-24	Gaillot residuals; Uranus perturbed bX; a'=47.5 astr. units, 1913-1915
Box	Folders
13	1-25	Longitude least sq. sol.; a'=47.5 astr. units, 1913-1914
Box	Folders
14	1-29	Perturbation terms; longitude; a'=47.5 astr. units, 1913-1914
Box	Folders
15	1-9	Uranus perturbed by X; a'=47.5 astr. units, 1913
Box	Folders
16	1-11	So-called final solutions in first powers; S1 and S2 in second powers; a'=47.5 astr. units, 1913
Box	Folders
17	1-10	Eliminations of deltas; tabulated forms S3-S7 md; T1; graphite solutions of quadratics; a'=47.5 astr. units, 1913-1914
Box	Folders
18	1-11	Squares solution; S5 + S6; a'=47.5 astr. units, 1913-1914
Box	Folders
19	1-7	Squares solution; S9; longitude; a'=47.5 astr. units, 1913-1914
Box	Folders
20	1-14	Longitude; a'=51.25 astr. units, 1913-1914
Box	Folders
21	1-2 plus proofs	Memoir: "A Transneptunian Planet" original manuscripts, notebook and author's proofs with comments, 1909
Box	Folders
22	1	Memoir: "A Transneptunian Planet" author's proofs with comments, Undated
Box	Folders
23	1-13	Perturbations of Neptune, Jupiter and Saturn, Undated


Series 6) Correspondence, 1876-1916
Box	Folders
1	1	Abbe, Cleveland, 1894
1	2	Abbott, Lawrence A., 1906-1907
1	3	Acino, K.K., Undated
1	4	Adler, Cyrus, 1905
1	5	Aero Club of America, 1907
1	6	Agassiz, G. R., 1907-1909
1	7	Aitken, Dr. Robert G., 1915-1916
1	8	Akin, Louis, 1907
1	9	Albuquerque Morning Journal, 1905
1	10	Aldrich, Eleanor L., Undated
1	11	Allen, Samuel V., 1910
1	12	Allen, William L., 1904
1	13	Allen, William N., Undated
1	14	Allendorf, Mrs. E. Eugene, 1913
1	15	Alliot, Hector, 1916
1	16	Alter, Dinsmore, 1911
1	17	Alvan Clark and Sons, 1895-1909
1	18	American (Telegram), 1903
1	19	American Academy of Arts and Sciences, 1909-1910
1	20	American Book Company, 1909
1	21	American Geographical Society, 1911
1	22	Ames, J. S., 1903
1	23	Amory, Harcourt, 1896
1	24	Anderson, Nestilt K., 1916
1	25	Andres, Fred, 1907
1	26	Andrews, C.D.R., 1906
1	27	Antoniadi, E. M., 1909
1	28	Apfel-Murdoch Company, 1903
1	29	D. Appleton and Company, 1905
1	30	Appleton, Francis (Harvard Club of N.Y.), 1909
1	31	Archeological Institute, Boston Society, 1894
1	32	Argus Pressclipping Bureau, 1903-1905
1	33	Arizona Central Bank, 1901
1	34	Arizona Republic, 1914
1	35	Arnot, Raymond H., 1907
1	36	Arnoux, William H., 1901
1	37	Ashurst, Henry F., 1907
1	38	Asiatic Society of Japan, 1907
1	39	Associated Press, 1911-1916
1	40	Astronomical and Astrophysical Society of America, Comet Committee, 1912
1	41	Atchison, Topeka, and Santa Fe Railway Company, 1906-1907
1	42	Atkins, Charles D., 1909
1	43	Atkinson, H. M., 1906-1907
1	44	Atwater, Horace G., 1907
1	45	Austin, O.P., 1905
1	46	Babbitt Bros., 1903-1905
1	47	Backman, J. B., 1907
1	48	Badger, Richard G., 1909
1	49	S. R. Bailey and Co., 1913
1	50	Bain, George Grantham, 1907
1	51	Baker, S. H., 1909
1	52	Bakhuyzen, H. G. Van De Sande, 1901-1918
1	53	Banta, Albert F., 1910
1	54	Barnard, E. E., 1906-1916
1	55	Bart, Mary, 1909
1	56	Barton, Samuel M., 1916
1	57	Bassett, Claude, 1916
1	58	Baty, G. M., 1907
1	59	Baume Pluvinel, Aymar de la, 1912
1	60	Baumgras, W. H., 1901
1	61	Bechhold, H., 1907
1	62	Bedell, C. H., 1909
1	63	Bell, Guido, 1909
1	64	Bemforad, A., 1913
1	65	Berberich, A., 1907
1	66	Bicknell, M. O., 1915
1	67	Bigelow, W., 1894
1	68	Bigourdan, M. G., 1913
1	69	Bigs, C. V., 1905
1	70	Birr Castle, 1906
1	71	Bissell, Joseph E., 1931
1	72	Black, A. C., 1907
1	73	Blake, Mrs. J. C., 1907
1	74	Blathwayt, Theodore B., 1910
1	75	Bolton, Scriven, 1907
1	76	Bond, Elizabeth, 1902
1	77	Book Omnorium, 1910
1	78	Boothroyd, Samuel L., 1916
1	79	Henry Bosch Co., 1907
1	80	Boss, Lewis, 1909-1911
1	81	Boston American, Undated
1	82	Boston Camera Club, 1902
1	83	Boston Gas Light Co., 1897
1	84	Boston Globe, Undated
1	85	Boston Transcript, 1903
1	86	Bostonian Society, 1907
1	87	Botay, Mrs. M. L., 1907
1	88	Botham, Richard C., 1930
1	89	Bourget, Henry, 1908
1	90	Bowditch, Vincent Y., 1907
1	91	Bowlker, T.J., 1906
Box	Folders
2	1	Brackett, W. H., 1916
2	2	Braemer, E. B., 1909
2	3	Brannen, D. J., 1894
2	4	Brashear, John A., 1894-1906
2	5	Bredee, Giacomo, 1907
2	6	Brennan, Thomas J., 1914
2	7	Brett, George H., 1909-1911
2	8	Brigham, Ethel Percy, 1894
2	9	British Association for the Advancement of Science, 1909
2	10	British Museum - Department of Printed Books, 1906
2	11	Brooks, William R., 1899
2	12	Brougham, H. B., 1916
2	13	Brourogen, Howard, Undated
2	14	Brown, Arthur R., 1907
2	15	Brown, Frank E., 1907
2	16	Brown, John Howard, 1905-1907
2	17	Brown, Mrs. L. C., 1903
2	18	Brown, Percy C., Undated
2	19	Brown, S. J., 1900
2	20	Bryan, W. L., 1907
2	21	Bryant, Ernest C., 1909
2	22	Bryant, Walter W., 1907
2	23	Buchanen, L. B., 1915
2	24	Buck, B. F., 1905
2	25	Buel, C. C., 1907
2	26	Bullock, W. F., 1907-1909
2	27	Bumpus, Herman Carey, 1907
2	28	Burley and Tyrrell, 1901
2	29	Burnham, S. W., 1894-1916
2	30	Bush, C. A., 1896
2	31	Butler, Arthur P., 1907
2	32	Butler, C. P., 1907-1908
2	33	Butrick, Olive, 1916
2	34	Cadett and Neall, Ltd., 1902-1904
2	35	Campbell, P. L., 1916
2	36	Campbell, W. W., 1903-1905
2	37	Cane, Francis E., 1907
2	38	Carpenter, Arthur D., 1916
2	39	Carrigan, W., 1905-1909
2	40	Cattell, James McKeen, 1909
2	41	Century Magazine, The Century Co., 1902-1907
2	42	Chadburn, Charles N., 1907
2	43	Chandler, S. C., 1901-1903
2	44	Chapman, Miss, 1906
2	45	Chapman, Henry S., 1911
2	46	Chapman, Pearson, 1907
2	47	Chapman, T. I., 1915
2	48	Chandler, H., 1897
2	49	Chant, C. A., 1905-1916
2	50	Chately, J., 1913
2	51	Childs, John Lewis, 1901
2	52	Chisholm, Jennie, 1907
2	53	Claridge, J. T. W., 1905
2	54	Clark, J. W., 1909-1910
2	55	Clay, C. A., 1916
2	56	Clayton, R. H., 1907
2	57	Clement, E., 1907
2	58	Clerke, Agnes, 1906
2	59	Cob, Mrs. W. H., 1916
2	60	Coburn, Frederick W., 1903
2	61	Coffin, C. R., 1894
2	62	Cogshall, W. A., 1898-1907
2	63	Coit, Judson, 1906
2	64	Colliers Weekly Editor, 1907
2	65	Colony Trust Co., 1907
2	66	Conlin, John H., 1894
2	67	Conners, Jo, 1912
2	68	Connery, R., 1914-1915
2	69	Cook, Clara C., 1901
2	70	Cooke, Josiah P., 1892
2	71	Cooper, Irving S., 1909
2	72	Chamberlain, S. S. (Cosmopolitan Magazine), 1907
2	73	Cox, William J., 1903
Box	Folders
3	1	Crable, (no first name listed), 1916
3	2	Craig, George, 1916
3	3	Craig, William Jr., 1916
3	4	Cramer Dry Plate Company, 1903-1907
3	5	Crane, W. M., 1907-1916
3	6	Creswell, R. C., 1901
3	7	Crommelin, A. C. D., 1901-1911
3	8	Crookes, William, 1910
3	9	Cross, Charles R., 1903
3	10	Cuppaidge, Henry, 1909
3	11	Curtis, (no first name listed), 1912
3	12	Curtis, Chester B., 1907
3	13	Daily Mail, London, 1907
3	14	Daily Mirror, London, 1907
3	15	Daingerfield, Lawrence H., 1916
3	16	Daix, (no first name listed), 1900
3	17	Dana, Paul, 1903
3	18	Willial B. Dana Co., 1901
3	19	Davidson, George, 1910
3	20	Davis, Edward Gates, 1907
3	21	Davis, Herman S., 1903
3	22	Dawson, Alfred, 1907-1910
3	23	Deane, W., 1909
3	24	Dedham Polo Club, Undated
3	25	Delaney, Archibald G., 1907
3	26	Deming, Julia, 1915
3	27	Denning, W. F., Undated
3	28	Derby, George, 1902-1905
3	29	der Kinderen, Frank, 1916
3	30	Deutsches Museum, 1910
3	31	De Ward, Robert, 1904
3	32	Diaz, Porfirio, 1896
3	33	Dixon, Alexander C., 1907
3	34	Dobbie, H. W., 1906
3	35	Dobinson, W. J., 1906
3	36	Doe, Edward M., 1905-1909
3	37	Dole, Nathan, 1904
3	38	Domizio, Franceschini, 1915
3	39	Doolittle, Eric, 1911
3	40	Doratte, Sarah C., Undated
3	41	Doubleday, Page, and Co., 1905
3	42	Douthat, R. W., 1917
3	43	Dorr, Charles H., 1915
3	44	Drake, A. W., 1907
3	45	Drew, (no first name listed), 1901
3	46	Drew, Charles A., 1915
3	47	Droppers, Garrett, 1905
3	48	Dugan, R. S., 1905
3	49	Duncan, J. C., 1900-1911
3	50	Earhart, J. F., 1907
3	51	Earle and Longstreth, 1903
3	52	Early, J. M., Undated
3	53	Eastman Kodak Co., 1907
3	54	Easton, C., 1909
3	55	Eaton, E. L., 1911
3	56	Edgington, Doris, 1914
3	57	Eichelberger, W. S., 1916
3	58	Eldredge, Edward H., 1909
3	59	Elkin, William L., 1911
3	60	Elvins, Andrew, 1909
3	61	Ely, Lydia, 1897
3	62	Emmanuel, Victor, 1913
3	63	Emmerick, Harriet A., 1930
3	64	Emmet, W. S. R., 1907
3	65	Emory, Elizabeth, 1907
3	66	Ernst, Harold C., 1909
3	67	Esmond, D. W., 1911
3	68	Everett, Edward, 1903-1916
3	69	Evermann, Barton W., 1909
3	70	Farman, M., 1907
3	71	Fast, A. H., 1907
3	72	Felder, R. H., Undated
3	73	French, Ferdinand F. (French Carriage Co.), 1902-1904
3	74	Ferree, Anna B., 1903
3	75	Fewkes, J. Walter, Undated
3	76	Field Columbian Museum, 1909
3	77	Field, Constante, 1909
3	78	Field, Mary F., Undated
3	79	Field Museum of Natural History, 1909
3	80	Fischer, O. W., 1902
3	81	Fisher, A. K., 1907
3	82	Fishler, Franklin, 1907
3	83	Fitts, George H., 1894
3	84	Fitzhugh Jones, J., 1901,
3	85	Flagstaff, Arizona Mayor, 1894
3	86	Flagstaff Opera House, Undated
3	87	Flammarion, Camille, 1907
3	88	Fling, M. Glen, 1903
3	89	Flynn, Edward F., 1916
3	90	Folmer and Schwing Co., 1907
3	91	Forbes, Edwin H., 1907
3	92	Fosdick, R. E., 1909
3	93	Foster, William E., 1913
3	94	Fox, Philip, 1909-1916
3	95	Fred Harvey Company, 1909
3	96	Freeman, E. S., 1913
3	97	French, Benj. and Co., 1902
3	98	Frizzell, B. E. and Co., 1905
3	99	Frost, Edwin B., 1907
3	100	Fuller, Loie, 1909
3	101	Fullerton, R. M., 1916
3	102	Funk and Wagnalls Co., 1910
Box	Folders
4	1	Douglass, A.E., February to March, 1894
4	2	Douglass, A.E., March, 1894
4	3	Douglass, A.E., April 1-9, 1894
4	4	Douglass, A.E., April 10-30, 1894
4	5	Douglass, A.E., May 1-24, 1894
4	6	Douglass, A.E., July to December, 1894
4	7	Douglass, A.E., Undated
Box	Folders
5	1	Douglass, A.E., January, 1895
5	2	Douglass, A.E., February, 1895
5	3	Douglass, A.E., March to May, 1895
5	4	Douglass, A.E., April to November, 1895
5	5	Douglass, A.E., March 1896 - September 1897 ,
5	6	Douglass, A.E., 1900-1901
5	7	Douglass, A.E., 1899-1906
Box	Folders
6	1	Gaertner, William, 1905-1907
6	2	Gaillot, A., 1913-1914
6	3	Gallois, A., 1897-1901
6	4	Garrison, Francis J., 1901
6	5	Gautier, Raoul, 1916
6	6	Gay, F. L., 1907
6	7	Gayler, Sara B., 1907
6	8	Germain Fruit Co., 1905
6	9	Gilder, R. W., 1907
6	10	Gill, David, 1910
6	11	Gill, Thomas B., 1916
6	12	Gillett, Frederick H., 1905
6	13	Gilman Joslin and Son, 1903
6	14	Ginder, William E., 1909
6	15	Gingrich, Curvin H., 1916
6	16	Ginn and Co., 1901
6	17	Glanville, W. E., 1915-1916
6	18	Gleason, Herbert W., 1907
6	19	Goddard, M., Undated
6	20	Golder, F. A., 1916
6	21	Goodell, Mrs. , 1907
6	22	Goodman, Charles, 1903
6	23	Goodwin, May Belle, 1911
6	24	Gorruex, G. N., 1909
6	25	Gosney, E. S., 1901
6	26	Gould, Elwyn B., 1907
6	27	Gould, James E., 1907-1909
6	28	Gould, Marie, 1910
6	29	Goulet, Phileas, 1916
6	30	Graham, Gussie, 1907
6	31	Grant, George, 1907
6	32	Grant, Madison, 1915
6	33	Grass, M. H. W., 1899
6	34	Gray, Morris, 1901-1907
6	35	Green, Henry J., 1901
6	36	Green, Wyman R., 1911
6	37	Greene, Henry Copley, 1907
6	38	Gregg, Laura, 1909
6	39	Greve, Clifford, 1907
6	40	Griffin, T. D., 1905
6	41	Griswold, C. S., 1914
6	42	Grosvenor, Gilbert H., 1907-1908
6	43	Groves, Frank, 1905
6	44	Guillaume, I., 1912
6	45	Gundersen, May, 1907-1909
6	46	Hadley, Arthur (Yale President), 1910
6	47	Haeckel, Ernst, 1907
6	48	Hagen, J. G., 1915-1916
6	49	Hagen, Marie S., Undated
6	50	Haines, Fannie B., 1905
6	51	Hale, Edward E., 1909
6	52	Hall, Edwin H., 1910-1912
6	53	Hamfray, E. F., 1907
6	54	Hamilton, G. H., 1916
6	55	Hamlen, P. M., 1907
6	56	Hammer Dry Plate Co., 1901
6	57	Hampson, William, 1907-1909
6	58	Hampton, A. B., 1907
6	59	Hanawalt, Francis W., 1906
6	60	Hand, H. E., 1907
6	61	Harding, E. H., Undated
6	62	Harding, John W., 1907
6	63	Hardy, J. J., 1906
6	64	Harnsworth Publications, 1911
6	65	Harper, E., 1909
6	66	Harper, Franklin W., 1907
6	67	Harpham, F. E., 1907
6	68	Harrel, C. L., 1911
6	69	Harris, George, 1907
6	70	Harshman, Walter S., 1901-1905
6	71	Hart, F. W., 1916
6	72	Hart, James N., 1916
6	73	Hartford Courant, 1914
6	74	Hartness, James, 1911
6	75	Harwood, Margaret, 1915
6	76	Hastings, J. B., 1907
6	77	Hawks, Ellison, 1909-1913
6	78	Hays, (no first name listed), 1902
6	79	Headland, Isaac Taylor, 1907
6	80	Heiman, Russell, 1909
6	81	Heliotype Printing Co., 1901
6	82	Helmsing, J. B., 1903
6	83	Henderson, J. H., 1916
6	84	Henley, G. J., 1907
6	85	Henroteau, F., 1916
6	86	Henry Holt and Company, 1909
6	87	Hensing, Fred, 1907
6	88	Hewins and Hollis, Boston, 1901
6	89	Heyer Brothers, Boston, 1897
Box	Folders
7	1	Higginson, (no first name listed), 1906
7	2	Hill, Beulah C., 1903-1905
7	3	Hillig, Fred J., 1909
7	4	Hinckley, W., 1909
7	5	Hitchcock, E. A., 1904
7	6	Hoar, Roger Sherman, 1906
7	7	Hobart, Clark, 1909
7	8	Hodge, F. W., 1907
7	9	Hodges, N. D. C., 1900
7	10	Holcomb, Leo, 1907
7	11	Holden, (no first name listed), 1894
7	12	Holland, E. O., 1916
7	13	Holsinger, S. J., 1909
7	14	Hooper, Franklin W., 1907
7	15	Hooper, Lewis, and Co., 1901
7	16	Horton, Frederick L., 1901
7	17	H. O. Houghton and Company, 1896-1906
7	18	Houghton, Mifflin, and Company, 1901-1907
7	19	E. Howard Clock Co., 1905-1909
7	20	Howe, (no first name listed), 1902
7	21	Howland, A. M., 1909
7	22	Howland and Dewey Co., 1907
7	23	Huffer, T. A., 1910
7	24	Huggins, William, 1902-1910
7	25	Hughbanbank, Leroy, 1910
7	26	Hunting, H. G., 1908-1909
7	27	Huyler and Co., 1901
7	28	Hussey, Harry, 1901-1910
7	29	Illustrated London News, 1903
7	30	International Press Service, 1907
7	31	International Union for Cooperation in Solar Research, 1910
7	32	Ireland, Lilian Brown, 1905
7	33	Isle, A. G., 1909
7	34	Izzard, W. H., 1907
7	35	Jack, Butler, 1916
7	36	Jacks, W. E., 1908
7	37	Jackson, Dugald C., 1907
7	38	Jacob, Hamer, 1916
7	39	Jacobson, John, 1906
7	40	Unknown correspondent about "Jacoby," , 1913
7	41	Jayne, J. L., 1912
7	42	Jenkins, B. G., 1905
7	43	Jervey, Frances, 1906
7	44	H. Jevne Co., 1901-1911
7	45	Jewell, E. P., 1899
7	46	Jewell, Lewis E., 1905
7	47	Joac, Fran R., 1918
7	48	Johannsen, N., 1909
7	49	Johnson, C. W., 1916
7	50	Johnson, Charles, 1910
7	51	Johnson, R. U., 1907
7	52	Jones, B. T., 1909
7	53	Jones, Ernest La Rue, 1907
7	54	Jones, George S., 1901
7	55	Jones, Howel, 1903-1905
7	56	Jones, Jame W., 1913
Box	Folders
8	1	Kamienstschikoff, N., 1916
8	2	Kansas Buff Brick and Manufacturing Co., 1915
8	3	Kauffman, Reginald Wright, 1909
8	4	Kellogh, Warren F., 1907
8	5	Kendell, Lyman B., 1915
8	6	Kennedy, William, 1930
8	7	Kenney, Melvin W., 1907
8	8	Kenyon, James B., 1913
8	9	Kienti, H., 1907
8	10	Kerby, Frederick, 1910
8	11	Keystone View Co., 1916
8	12	Kiel Observatory, 1912
8	13	Kinder, Vernon R., 1909
8	14	Kirby, O. C., 1907
8	15	Klug, Alfred, 1926
8	16	Knight, William H., 1903
8	17	Knop, George, 1907
8	18	L. E. Knott Apparatus Co., 1902
8	19	Knowles, L. E., 1909
8	20	Kobold, Hermann, 1909-1916
8	21	Kohl, Torvald, 1915
8	22	Koopman and Co., 1909
8	23	Kornacher, George, 1905
8	24	Krentz, H., 1903-1907
8	25	Krinov, Eugene, 1924
8	26	Kulz, Fred B., 1905
8	27	P. C. Kuyper and Co., 1909
8	28	Lagerlof, C. G., 1905
8	29	Lake, (no first name listed), 1914
8	30	Lampard, Henry, 1899-1916
8	31	Lampland, Carl Otto, 1903-1907
8	32	Lampland, Carl Otto, 1908-1911
8	33	Lampland, Carl Otto, 1912-1916
8	34	Lampland, Verna, Undated
8	35	Lane, Alfred C., 1909
8	36	Langley, S. P., 1894-1905
8	37	Lanier, Reginald B., 1916
8	38	Larkin, Edgar L., 1901
8	39	Lawrence, Robert M., 1901
8	40	Leavenworth, F. P., 1906
8	41	Leavenworth, W. S., 1909
8	42	Lebon, E., 1903
8	43	Lehrman, Kate, Undated
8	44	Leland, O. M., 1916
8	45	Leland, Samuel Phelps, 1903
8	46	Lenhart, W. G., 1909
8	47	Leon, Luis G., 1903
Box	Folders
9	1	Leonard, Wrexie Louise, 1909-1916
9	2	Leuschner, A. O., 1915-1916
9	3	Levi, Riso, 1909
9	4	Lewis, C. L., 1916
9	5	Libert, Lucien, 1899-1907
9	6	Lincoln, C. M., 1909
9	7	Listener, 1909
9	8	Livermore, Augusta, Undated
9	9	Liverpool Free Public Library, 1906
9	10	Livingston, H. J., 1904
9	11	Andrew J. Lloyd and Co., 1901-1905
9	12	Lockyer, Norman, 1915-1916
9	13	Lodge, H. C., 1905
9	14	Loewy, M., 1901-1905
9	15	Lohse, (no first name given), 1907-1909
9	16	Loine (or Laine), F. C., 1909
9	17	Lombard, Louis B., 1908
9	18	Long, Ray, 1910
9	19	Longmans, Green, and Co., 1909
9	20	Lookabill, H. Randel, 1910
9	21	Looker, Ernest, 1916
9	22	Los Angeles Examiner, Undated
9	23	Lovering, William, 1905
9	24	Lovett, Edgar Odell , 1905-1906
9	25	Lowell, Amy, 1905
9	26	Lowell, A. Lawrence, 1896-1909
9	27	Lowell, Augustus, 1894
9	28	Lowell, Katharine, 1890-1894
9	29	Lowell, Guy, 1907
9	30	Lowell, Mrs. Judge, 1903
9	31	Lowell Observatory Accounts, 1903
9	32	Lowell, Robt. T. S., 1912
9	33	Luby, William A., Undated
9	34	A. Lumiere and ses Fils, 1904-1905
9	35	Lundin, Carl A. R., 1901-1909
9	36	McAdoo, Williams Gibbs, 1916
9	37	McAlister, E. H., 1897
9	38	MacCauley, (no first name listed), 1908
9	39	McClure, S. S., 1907
9	40	A. C. McClurg and Co., 1903-1909
9	41	McCullagh, George M., 1907
9	42	Macdonald, J. Kenneth, 1903-1914
9	43	Macdonald, S. L., 1909
9	44	McDonnell, P. E., 1914
9	45	MacDougal, D., 1907
9	46	McDowell, James B., 1904
9	47	McGoodwin, Preston, 1909
9	48	McIntyre, Charles Jr., 1916
9	49	McKee, D. W., 1914
9	50	McKeller, A., 1912
9	51	McKenzie, Alexander, 1896
9	52	McLean, E. G., 1909
9	53	Macmillan Co., 1907-1909
9	54	Macpherson, Hector, 1903-1909
9	55	MacPherson, James, 1910
9	56	McPherson, William D., 1907
9	57	MacQueen, Peter, 1907
9	58	Magee, Walter, 1930
9	59	Mailhat, Atrs. R., 1913
9	60	Manhattan Press Clipping Bureau, 1903
9	61	Mannings, G., 1906
9	62	Manson, E. S. Jr., 1900
9	63	Markham, William, 1916
9	64	Marques, A., 1897
9	65	A. N. Marquis and Co., 1907
9	66	Marsh, Mrs. George H., 1909
9	67	Marsh, Ogden, 1916
9	68	Marshall, Elmer E., 1907
9	69	Marshall Field And Co., 1903-1910
9	70	Martin, Isabel E., 1905
9	71	Marvin, P., Undated
9	72	Massachusetts Institute of Technology, Undated
9	73	Maunder, E. Walter, 1903
9	74	Mayflower, Leslie, 1916
9	75	Maynard, Allan, 1894
Box	Folders
10	1	Meade, Joseph Lyons, 1912
10	2	Menke, H., 1907
10	3	Mercer, H. C., 1890
10	4	Meredith and Grew, 1907
10	5	T. O. Metcalf and Co., 1911
10	6	Metz, Blanche, Undated
10	7	Mexico Minister to U.S., 1896
10	8	Mexico Senate and the Chamber of Deputies, 1896
10	9	Meyrowitz, E. B., 1907
10	10	Michelson, A., 1905
10	11	Michiels, R., Undated
10	12	Middleton, P. Harvey, 1909
10	13	Miller, (no first name listed), 1916
10	14	Miller, George A., 1909-1910
10	15	Miller, John A., 1903-1915
10	16	Milligan, Eugene, 1905
10	17	Millikan, R. H., 1911
10	18	Minto, John, 1906
10	19	Mitchell, Walter M., 1907
10	20	Miyaoka, Tsunejiro, 1916
10	21	Moench, L. F., 1907
10	22	Montgomery Ward and Co., 1901-1903
10	23	Moore, Willis L., 1906-1912
10	24	Moramski, A., 1894
10	25	Morehouse, D. W., 1906
10	26	Morehouse, George W., 1901
10	27	Morris, Fritz, 1907
10	28	Morse, Edward S., 1903-1913
10	29	Moseley, E. L., 1916
10	30	Moye, M., 1916
10	31	Muelle y Leon, Miguel, 1930
10	32	Munk, Joseph Amasa, 1908-1916
10	33	Munn and Co., 1907-1909
10	34	Nance, Thomas, 1907
10	35	National Geographic Society, 1907
10	36	Naulty, Edwin Fairfax, 1910
10	37	Nepera Chemical Co., 1901
10	38	Newcomb, Simon, 1903-1907
10	39	Newman, W. A., 1907
10	40	New York Herald, 1903
10	41	New York Times, 1905-1915
10	42	New York World, 1903
10	43	Thos. P. Nichols and Sons, 1909
10	44	Niemoller, L. J., 1895
10	45	Nolte, G. H., 1909
10	46	Norman, W. H., 1905
10	47	Norris, T. G., 1907
10	48	Norton, T. J., 1907
10	49	Notman, Frederick W., Undated
10	50	Noyes, Arthur A., 1907-1908
10	51	Noyes, Frank H., 1909
10	52	Oakeley, Edward M., 1907
10	53	Observatoire d'Hem, 1909
10	54	Observatoire Royal de Belgique, 1915
10	55	Observatorio Astronomico Nacional Mexicano, 1899-1906
10	56	Observatorio de Marina de San Fernando, 1907
10	57	Astronomical Observatory Montevideo, Uruguay, 1906-1911
10	58	The Observatory, Editor, 1894
10	59	O'Connor, Johnson, 1909-1915
10	60	Oliver, William, 1906
10	61	Olney, Richard, 1897
10	62	Onthank, K. W., 1916.
10	63	Orr, William M., 1907
10	64	Osborn, Henry Fairfield, 1907-1909
10	65	Osborne, J., 1913
10	66	Otis, Herbert J., 1909
10	67	The Outlook, 1907
10	68	Overland Telephone and Telegraph Co., 1912
Box	Folders
11	1	Putnam, Elizabeth Lowell, 1876-1877
11	2	Putnam, Elizabeth Lowell, 1882-1884
11	3	Putnam, Elizabeth Lowell, 1886-1889
11	4	Putnam, William and Elizabeth Lowell, 1890-1893
11	5	Putnam, Elizabeth Lowell, 1891
11	6	Putnam, William Lowell, 1903
11	7	Putnam, William and Elizabeth Lowell, 1907-1911
11	8	Putnam, William Lowell, 1912-1916
11	9	Various loose letter pages and Harvard Houghton Collection, Undated
11	10	Putnam, William Lowell, 1897-1913
Box	Folders
12	1	Paffrath, J., 1909
12	2	Palisa, Johann, 905-1913
12	3	Palmer, George S., 1905
12	4	Park, Lawrence, 1916
12	5	Parker, E. C. S., Undated
12	6	Parker, Joseph J., 1907
12	7	Parker, W. H., 1909
12	8	Parlin, Raymond W., 1905
12	9	Parra-Mantois and Cie, 1907-1908
12	10	Payne, William W., 1894-1908
12	11	Peabody, (no first name listed), 1911
12	12	Pearson, H. W., 1904-1906
12	13	Peck, Morris, 1916
12	14	Peirce, G. J., 1916
12	15	Peirce, James Mills, 1906
12	16	Pendleton, W. H., 1905
12	17	Penman, John Simpson, 1909
12	18	Pennsylvania University, 1907
12	19	Perin, George L., 1905
12	20	Perrine, C. D., 1911
12	21	C. J. Peters and Son, 1903
12	22	Petitdidier, O. L., 1907-1915
12	23	The Philosophical Society of Washington, 1907
12	24	Pickens, James M., 1909
12	25	Pickering, Edward C., 1894-1910
12	26	Pickering, W. H., 1894
12	27	Pickering, W. H., 1894-1916
12	28	S. S. Pierec and Co., 1901
12	29	Pink, J., 1906
12	30	Pitts, E. L., 1909
12	31	Platen, Bettie, 1914
12	32	Plummer, J. H., 1897
12	33	Plympton, C. W., 1900
12	34	Pollock, T. E., 1903-1912
12	35	Poole, Lula, 1909
12	36	Popular Astronomy, 1905-1916
12	37	Porter, Albert B., 1907
12	38	Porter, Alfred W., 1909
12	39	Porthouse, William, 1911
12	40	Pousland, F. G., 1905-1907
12	41	Powell, B. B., 1906
12	42	Powers, Ella Xenette, 1909
12	43	Prince, Fred W., 1905
12	44	Prinz, W., 1903
12	45	Pritchett, Henry S., 1902-1906
12	46	Proctor, Mary, 1911
12	47	Putnam, Charles, 1904
12	48	Quinlan, Larry W., 1903
12	49	Quinn, P. E., 1907
Box	Folders
13	1	Rathbun, Richard, 1905
13	2	Ray, Violet, 1930
13	3	Real Observatorio Astronomico de Lisboa, 1906
13	4	Reaser, G. W., 1907
13	5	Rees, J. K., 1902
13	6	Regina Music Box Co., 1903
13	7	Reinhardt, Ernst, 1910
13	8	Remsen, Ira, 1901
13	9	Reynolds, N. L., 1909
13	10	Rheden, Joseph, 1910
13	11	Rhodes, Chas. H., 1909
13	12	Richardson, G. M., 1894-1895
13	13	Rideing, William H., 1909
13	14	Rigge, William F., 1915
13	15	Rignano, Eugenio, 1909-1915
13	16	Ringland, E. B., 1909
13	17	Riordan, M. J., 1907-1912
13	18	Riordan, T. A., 1905-1910
13	19	Ripley, E. P., 1905-1909
13	20	Ritchie, John Jr., 1896-1909
13	21	Ritchey, George Willis, 1906-1909
13	22	Roberts, A. E., 1909
13	23	Roberts, J. H., 1912-1916
13	24	Rogers, Emma, Undated
13	25	Rollins, Emma C., 1920
13	26	Romero, Matias, 1896
13	27	Roosevelt, Emlen, 1908
13	28	Roosevelt, James, 1908
13	29	Ross, A. D., 1914
13	30	Ross, John M., 1909
13	31	Rotch, A. Lawrence, 1909
13	32	Royal Astronomical Society, 1906-1909
13	33	Royal Astronomical Society of Canada, 1909
13	34	Royal Institution, London, 1910
13	35	Royal Photographic Society of Great Britain, 1907-1911
13	36	Romeike, Henry, 1897-1907
13	37	Rupert, Chas. G., 1910
13	38	Russ, Nellie M., 1903
13	39	Ryan, T. C., 1907
13	40	E.M.S., Undated
13	41	Sands, Robert C., 1907
13	42	Santa Fe Railway, 1910
13	43	Sargent, (no first name listed), 1909
13	44	Sarrgrief, A. G., 1897
13	45	Schaeberle, J. M., 1900-1906
13	46	Scheding, C., 1907
13	47	Schiaparelli, Giovanni, 1903-1909
13	48	Schirmer, Ernest C., 1913
13	49	Schraplan, Gustav, 1915
13	50	Schwarzchild, K., 1913
13	51	Schwotzer, Adolf, 1907
13	52	Science Magazine, 1895-1909
13	53	Charles Scribner's Sons, 1905
13	54	Scott, Jas. C., 1909
13	55	Scudder, W. S., 1897
13	56	Seagrave, F. E., 1915
13	57	Seares, F. H., 1910
13	58	Sedgwick, W. T., 1907
13	59	See, T. J. J., 1897-1912
13	60	M. A. Seed Dry Plate Co., 1901-1907
13	61	Seeliger, H., 1913
13	62	Sessily, D., 1917
13	63	Sharman, L. W., 1909
13	64	Shearmen, T. S. H., 1905
13	65	Shepstone, Harold J., 1907
13	66	Sherwood, George H., 1907
13	67	Sill, Alice H., Undated
13	68	Simms, W. L., 1909
13	69	Simonson, B. F., 1906
13	70	Sisson, F. W., 1901
13	71	Sliker, E. A., 1905-1911
13	72	Slipher, E. C., 1907-1916
Box	Folders
14	1	Slipher, V. M., 1901
14	2	Slipher, V. M., 1902
14	3	Slipher, V. M., 1903
14	4	Slipher, V. M., 1904
14	5	Slipher, V. M., 1905
14	6	Slipher, V. M., 1906
14	7	Slipher, V. M., 1907
14	8	Slipher, V. M., 1908
14	9	Slipher, V. M., 1909
14	10	Slipher, V. M., 1910
14	11	Slipher, V. M., 1911
14	12	Slipher, V. M., 1912
14	13	Slipher, V. M., 1913
Box	Folders
15	14	Slipher, V. M., Incomplete dates
15	15	Slipher, V. M., 1914-1916
15	16	Slipher, V. M., 1914
15	17	Slipher, V. M., 1915
15	18	Slipher, V. M., 1916
Box	Folders
16	1	Sloan, Richard E., 1905-1907
16	2	Smith, Belle, 1906
16	3	Smith, Delia T., 1907
16	4	Smith, Mark A., 1907
16	5	Smith, W. A., 1903-1907
16	6	Smith, Tracy, 1907
16	7	Smith and Eigenmann, 1909
16	8	Smithers, Joseph P., 1907
16	9	Smyser, Fanny, Undated
16	10	Snyder, Chas. P., 1909
16	11	Social Register Association, 1905-1916
16	12	Soh, Pom K., 1894
16	13	Somerset Club, 1907
16	14	Sohier, William D., 1905
16	15	Sohne, C. A. Steinheil, 1905
16	16	Spicer, C. E., 1907
16	17	Stahn, Justice, 1901
16	18	Standard Engraving Co., 1897
16	19	John B. Stetson Co., 1903
16	20	Stevens, E. B., 1916
16	21	Stevenson, Al, 1909
16	22	Stevenson, Robert, 1916
16	23	Stoddard, Henry Lee, 1913
16	24	Stonecipher, J. F., 1906
16	25	Story, William Edward, 1895-1910
16	26	Stover, Edmund, 1910
16	27	Stratton, S. W., 1903
16	28	Stromgren, (no first name listed), 1915
16	29	Sturm, Harry R., 1909
16	30	Suffolk National Bank, 1897
16	31	Swift, E. B., 1907
16	32	Swift, Lewis, 1901-1904
16	33	Sykes, Godfrey, 1902-1907
16	34	Taft, Chas. P., 1909
16	35	Talbot, B. B., 1907
16	36	Talbot, Hayden, 1907
16	37	Tanaka, Inagi, 1906
16	38	Taylor, Charles, 1906
16	39	Techno-Photographisches Archiv, 1916
16	40	Termansen, G. J., 1907
16	41	Tetens, Otto, 1905
16	42	Thayer, Wm. R., 1903
16	43	"Theodore," , 1908
16	44	Thomas, Bessie, 1907
16	45	Thompson, E. A., 1908
16	46	Thompson, S. Millett, 1907
16	47	Thompson and Leavitt, 1909
16	48	Thomson, Elihu, 1907-1910
16	49	Thornber, J. J., 1907
16	50	Ticknor and Co., 1885
16	51	Tiffany and Co., 1910
16	52	Tittmann, O. H., 1903
16	53	Todd, David, 1897-1907
16	54	Tomkins, H. G., 1907
16	55	Tory, H. Marshall, 1912-1913
16	56	Townshend, (no first name listed), 1906
16	57	Trelease, William, 1907
16	58	Trowbridge, John, 1909
16	59	Trumbull and Beebe, 1905
16	60	Tucker, E. H., 1916
16	61	Turner, G. H., 1909
16	62	Turner, H. H., 1895-1909
16	63	Turney, Omar A., 1903
16	64	Tyler, H. W., 1907
16	65	Tyler, Sarah E., 1895
16	66	Union Club of Boston, 1905
16	67	University of Chicago, 1909
16	68	Unknown Correspondent, 1916
16	69	Upton, Winslow, 1906-1907
16	70	U.S. Minister to Mexico, 1897
16	71	Uruguay, Montevideo Observatory Director, 1906
16	72	Vabre, C., 1916
16	73	Valle, Felipe, 1898-1907
16	74	Van Anda, C. V., 1905-1907
16	75	Van Norden Magazine, 1907
16	76	Vaux, C. Bowyer, 1916
16	77	Verkamp, Leo F., 1907
16	78	Very, Frank W., 1906-1910
16	79	Very, Frank, 1914-1916
16	80	Viguez, Marco, 1917
16	81	Viollavaso, E. J., 1916
Box	Folders
17	1	Wadmore, R. Lyndhurst, Undated
17	2	Waldo, Frank, 1905
17	3	Walker, Asa, 1907
17	4	Walker, J. E., 1907
17	5	Walker, Williston, 1907
17	6	Wallace, R. James, 1903-1907
17	7	Wanamaker, John, 1901
17	8	Ward, Herbert D., 1907
17	9	Ward, Lester F., 1907
17	10	Warren, H. M. Jr., 1907
17	11	Washburn, J. T., Undated
17	12	Washington University Board of Regents, 1916
17	13	Watson, Francis, 1906
17	14	Watson, Carrie M., 1906
17	15	Watts, H. Stuart, 1909
17	16	Webber, B. C., 1916
17	17	Weber, C. F., 1903
17	18	Weber, George L., 1909-1916
17	19	Webster, A. G., Undated
17	20	Webster, Stone, 1906
17	21	Weeden, William O., 1907
17	22	Welch, Harry, 1915-1916
17	23	Weld, Laenas Gifford, 1907
17	24	Wellman, George F., 1905-1909
17	25	Wellons, Robert H., 1905
17	26	Wendell, Barrett, Undated
17	27	Wendell, S. G., Undated
17	28	Wesley, (no first name listed), 1907
17	29	Western Union Telegraph Co., 1916
17	30	Whaley, Charles Faustus, 1916
17	31	Wheeler, C. K., 1909
17	32	Wheeler, Edward J., 1909
17	33	Wheelwright, John, 1907
17	34	White, J. E., 1909
17	35	White, James T., 1896
17	36	White, W. F., 1896
17	37	Whiting, Lilian, 1901-1909
17	38	Whiting, Sarah F., 1903
17	39	Whitmell, Charles J., 1907
17	40	Wickersham, George W., 1912
17	41	Wicks, Mark, 1907
17	42	Widstoe, John A., 1916
17	43	Wieland, G. R., 1907
17	44	Wilbur, Roy Lyman, 1916
17	45	Wilcox, Philip Wakeman, 1907
17	46	Willcox, E. S., 1907
17	47	Williams, E. C., 1906
17	48	Williams, E. D., 1915
17	49	Williams, E. E., 1907
17	50	Williams, Elizabeth Langdon, 1905-1912
17	51	Williams, Elizabeth Langdon, 1913-1916
17	52	Williams and Everett Co., 1901-1907
17	53	Williams, F. H., 1905
17	54	Williams, Frank B., 1909
17	55	Williams, Kenneth P., 1907
17	56	Williams, Stanley, 1909
17	57	Willson, Robert W., 1911
17	58	Willyoung, Elmer G., 1901-1902
17	59	Wilson, David H., 1914-1915
17	60	Wilson, Herbert C., 1914-1915
17	61	Wilson, Joe W., 1904-1913
17	62	Wilson, Latimer J., 1909-1916
17	63	Wolf, Max, 1909
17	64	Wood, R. W., 1909
17	65	Woodward, Corodon R., 1909
17	66	Woolley, Edwin C., 1916
17	67	Woolsey, T. S., 1907
17	68	Worthington, A. S., 1907
17	69	Worthington, James H., 1907-1911
17	70	Wolton, Percy O., 1907
17	71	Wright, Allen C., 1906
17	72	Wright, Allen Henry, 1909
17	73	Yamada, Yeihiro, Undated
17	74	Yerkes Observatory, 1909
17	75	Yoshimura, M., 1902
17	76	Younghusband, (no first name listed), 1903
17	77	The Youth's Companion, 1914
17	78	Zahl, William, 1915
17	79	Zeiss, Carl, 1907-1911
17	80	Zieger, Hermann, 1909


Series 7) Memorabilia, 1894-1916
	The objects in this series are located in the artifact collection.

Box
1		Lowell's Embroidered Shirt, 1916
Box
2		Lowell's Engraved Flask, Undated
Box
3		Lowell's Hat, Undated
Box
4		Lowell's Camera, Undated


Series 8) Personal, 1806-2016
Box	Folders
1	1	Purchase of Constance Keith's home at 11 West Cedar Street, Boston, 1896
1	2	Furniture of Beryl Kane in House at 11 West Cedar Street, Boston, 1896
1	3	Tax Assessment, 1916
1	4	50 Greatest Sons of Harvard Picked, 1906
1	5	Harvard Information: History in Biography review, 1933
1	6	Harvard Information: Courses in Astronomy, 1901-1902
1	7	Itinerary of 1916 Lecture Tour, 1916
1	8	Harvard Information: Installation of James Bryant Conant as President of Harvard, 1933
1	9	Lowell on His Death - Poems, 1917
1	10	Lowell on His Death - Tribute from Lowell Observatory, 1917
1	11	Lowell on His Death - Tribute from Appalachian Mountain Club, 1916
1	12	Lowell on His Death - Lowell Scholarship Prize, 1948
1	13	Last Will and Testament, 1913-1916
1	14	Lowell on His Death - Memorial from the Japan Advertiser, 1917
1	15	Missing, Unavailable ,
1	16	Commemorative Program on the Centennial Anniversary of Lowell's Death, 2016
1	17	Percival Lowell Eulogy, 1916
1	18	Biographical Sketch by V. M. Slipher, Undated
1	19	Lowell on His Death - Memorial by E. C. Slipher, 1916
1	20	Lowell on His Death - Memorial Card from Mrs.Constance Lowell, 1916
1	21	Reverend Charles Lowell Ordination, 1806
1	22	Pluto Article, 2006
1	23	Lowell's Funeral Notice, 1916
1	24	Address Delivered at Lowell's Funeral Service, 1916
1	25	List of Where and Who Received Announcement of Percival Lowell's Death, 1916
1	26	Mausoleum Plans, 1919
1	27	List of Pall Bearers, 1916
1	28	Death Announcement, 1916
1	29	Invitations to Various Events, 1907
1	30	Chronology of Percival Lowell's Life and Lowell Biblography by David Strauss, 1980
Box	Folders
2	1	Map of India, 1883 circa
2	2	Clippings and Receipts, 1905-1916
2	3	Notes, Articles, Expense Book, and Pamphlets, 1876-1916
2	4	Soul of the Far East, German Translation, 1926
2	5	Brookline Union Membership, 1886
2	6	Dedication of Mars and Its Mystery by Edward Morse, 1906-1909
Box
3		Scrapbook about Lowell, includes newspaper clippings about death and funeral, 1916