This is a facsimile copy of Alexander von Humboldt's letters to Bonpland (ca. 65 total), as well as Bonpland's botanical journal.

Correspondents include C. D. Ebeling, Alexander von Humboldt, and Henry Melchior Muhlenberg.

The letters in this small collection concern the Smithsonian Institution, the Colorado Territory, and Humboldt's observations, among many other topics.

This microfilm contains correspondence from scientists, including Friedrich Wilhelm Bissell, 1816-1846 [from Deutsche Akademie der Wissenschaften, Berlin]; Matthew F. Maury, 1849-1859 [from National Archives, Washington, D.C.]; Paulus Usteri, 1789-1821 [from Bibliothèque Universitaire, Zurich; and Johann G. Galle, 1836-1858 [from Frau von Heinz, Schloss Tegal]. There is also correspondence from the Royal Society, London; Bibliothèque Nationale, Geneva; Göttingen University Library; British Museum; Massachusetts Historical Society; Bancroft Library of the University of California; Yale University; Henry E. Huntington Library; Library of Congress; the Alexander von Humboldt Kommission; Westdeutsche Bibliotek, Marburg; and Deutsche Staatsbibliotek, Berlin. The materials were, in general, collected by Helmut de Terra and contain correspondence with various scientists. A few items pertain to Humboldt's travels and general comments on American Indian linguistics.

Transcripts and photocopies of Correia de Serra correspondence, made by Richard B. Davis for "The Abbé Correa in America," APS Transactions 45, 2 (1955). Seven mss. letters are also included.

This collection of Morton letters forms part of a bound volume of incoming correspondence. It is a companion volume to the original letters in the Morton collection at the American Philosophical Society, which were also originally bound. Most of the subjects of the two collections overlap, but additional subjects in the microfilmed collection include American Indians, archaeology, Egyptology, and phrenology.

Collection of 283 letters assembled and presented to the Academy of Natural Sciences of Philadelphia by John Torrey. Correspondents include: Louis Agassiz, Zaccheus Collins, Peter S. Du Ponceau, Elie M. Durand, Asa Gray, William Hembel, Alexander von Humboldt, William H. Keating, James Mease, Samuel G. Morton, George Ord, Charles Pickering, Constantine S. Rafinesque, Benjamin Silliman, Sr., John Torrey, Charles Waterton, Alexander Wilson.

Born in Paris on August 8, 1801, the youngest of four sons of Venceslas and Rose Laisné Jacquemont, Victor Jacquemont became one of the rising stars of French natural history and an archetype for the scientist in the Romantic era. Combining youth, genius, and a rhapsodic love of nature with a life filled with masculine affection, star-crossed romance, and exotic climes, Jacquemont epitomized the romantic intellectual right up to the time of his untimely death in the Himalayas. In a career in which ill fortune and good fortune walked hand in hand, the figure of Jacquemont has all but overshadowed his substantial scientific accomplishments. The surviving correspondence of the ill-starred French botanist, Victor Jacquemont and his friend, Pierre Achille Marie Chaper (1795-1874) consists of 106 letters pertaining to the development of Jacquemont's scientific career and their personal and social commitments. The correspondence was published, though not translated, in James F. Marshall, Victor Jacquemont Letters to Achille Chaper: Intimate Sketches of Life Among Stendhal's Coterie (Philadelphia: APS, 1960), APS Memoir 50.

This collection contains miscellaneous letters and papers relating to explorations of South America, Cuba, and Mexico; scientific investigations; Latin American antiquities and linguistics; and publications. There are also copies of 26 letters from Humboldt to Pierre Hyacinth Azais and Jules Berger de Xivrey, from originals at the Duke University Medical Center Library.

These are letters to Quetelet primarily on the subject of astronomy (meteorological observations), including charts showing directions of shooting stars.

This collection is comprised of materials from seven repositories and includes correspondence from Banks' colleagues and explorers, such as John Hope, Josiah Wedgwood, Georg Forster, and Captain William Bligh; records of expenses for voyages and journeys; and journals kept during voyages to New Foundland and Labrador (1766) and around the world with Captain James Cook (1768-1771). Topics include botany and horticulture, marine life, and collecting specimens.

The manuscripts of father William Mitchell and daughter Maria Mitchell are not easily separated, and are treated here together. The collection includes William Mitchell's autobiography, his memoir of Judge Walter Folger of Nantucket, astronomical and meteorological observations, lectures, family and other correspondence.

A pioneer in ethnographic and linguistic studies of the American Indian and one of the most active members of the American Philosophical Society, Peter Stephen Du Ponceau helped to establish the American Philosophical Society's reputation as one of the world's foremost centers for the study of American Indians and their languages. The Peter Stephen Du Ponceau collection consists of correspondence on legal matters, Indian linguistics, silk culture, maritime law, the American Philosophical Society, and various publications of the early nineteenth century. The collection also includes several essays by Du Ponceau, most of which deal with maritime law.

There is correspondence concerning geology, botany, natural history, natural selection, evolution, British science and scientists, and other scientific topics. Most of the letters are written by Lyell, with a very few items by others.

Through his craniometic studies of human races, the Philadelphia physician Samuel George Morton (1799-1851) exerted a profound influence on the development of physical anthropology in antebellum America, and made substantial contributions to mineralogy, paleontology, and natural history. Relating primarily to Morton's scientific interests, the Morton Papers include insights into Morton's perspectives on education, medical practice, geology and mineralogy, craniology, paleontology, the Wilkes Exploring Expedition (also known as the United States Exploring Expedition 1838-1842), and his two major monographs, the Crania Americana and Crania Aegyptiaca. Several of the letters were written by Morton in his capacity as corresponding secretary of the Academy of Natural Sciences of Philadelphia. Also included in this collection are Morton's "Some Remarks on the Infrequency of Mixed Offspring Between the European and Australian Races" (1850), Joseph Barclay Pentland's notes on the aborigines of Peru (ca. 1840?), and newspaper clippings on Morton's death; a diary of Morton's trip to the West Indies, 1834, a set of craniological sketches for use in Crania Americana, and a microfilm of letters in private hands, written to Morton, 1838-1844