Letters collected by Whitfield J. Bell, Jr., including correspondence and papers submitted to the Society. Pertains to APS members and associations. Includes letters by Franklin, Winthrop, Endecott, Eliot, etc. Scientific and historical references, primarily. Some of the subjects discussed are astronomy, botany, electricity, natural history, and Indian missions. Also included is Roger Curtis' "Journal of the Moravian Mission to Labrador."

These letters, from the Wellcome Historical Medical Society's collections, are on a variety of topics, primarily natural history and medicine.

This microfilm contains letters and drafts of replies, memoranda, lists of plants and shrubs, observations on natural history, diary notes, extracts from reading, and recipes. There is a "Catalogue of Books given to [Friends] Publick School of Philadelphia" by Collinson dated 1749. There is a copy by Collinson of a May 16, 1560 note by Elizabeth I of a gift of old clothes to her maids of honor. A 1811 letter is from C. S. Collinson to Aylmer Bourke Lambert.

These letters of American Philosophical Society members and prominent early American scientists were selected from Carson's extra-illustrated draft of "A History of the Medical Department of the University of Pennsylvania" (Philadelphia, 1869).

Letters and papers to or from American scientists or about America, selected from the Linnean Society's collections. Includes letters to William Swainson from John Abbott, John J. Audubon, Constantine S. Rafinesque, Isaac Lea, and John E. LeConte; letters to Sir James Edward Smith from Jacob Bigelow, DeWitt Clinton, J.F. Correia da Serra, David Hosack, Theodore Lyman, William Dandridge Peck, Rafinesque, and Gotthilf H.E. Muhlenberg; letters to William Darlington; letters to Asa Gray; letters of John Bartram; letters of Peter Collinson to J.F. Gronovius; letters and papers of John Ellis, including letters from Alexander Garden, Samuel Martin, and Bernard Romans; letters to Carl Linnaeus from John Bartram, John Clayton, Cadwallader Colden, Correia da Serra, Peter Kalm, Adam Kuhn, James Logan, John Mitchell, and Charles Wrangel.

This collection includes letters to and from Americans (including South America and the West Indies) and letters about America selected from the Society's manuscripts (Classified Papers, Letter Books, Letters and Papers, Royal Society Letters, Miscellaneous Correspondence, and other official groups) and from collections of private papers (Sir Charles Blagden, William Buckland, John Canton, Sir John F. W. Herschel, Sir Edward Sabine, and others). The documents range in time and character from John Winthrop, Jr., "A Description of the Artifice & Making of Tarr & Pitch in New England" (1662), to letters from Sir Thomas Edward Thorne to his wife describing the American West, where he was on a surveying party in the 1880s.