Commonplace book reproduced from the original in the possession of Mrs. John Robinson, Cranford, N.J., 1975.

This diary records the weather and appearances of birds, flowers, and insects.

Notebooks written during the voyage of the Beagle, 1831-1836. From eighteen original notebooks at Down House, Kent.

Correspondence to and from John Bartram and his son, William Bartram.

Letters dated post-1792 are from Francis Kinlock to "Prevost."

This correspondence is chiefly to William Bartram concerning personal matters and birds.

These letters relate to natural history and birds.

Correspondence to and from John Bartram and his son, William Bartram.

This correspondence, concerning botanical topics, includes lists of plants.

These are the Sloane manuscripts 4036-4069, comprised principally of letters to Sloane from scholars, physicians, naturalists, and collectors in Great Britain, Europe, and America.

This catalog was compiled by James R. Friday, Roy M. MacLeod, and Philippa Shepherd, and includes guides to published works, diaries, notebooks, journals, correspondence, and newspaper clippings.

These are letters from Jeremy Belknap, Aaron Dexter, Ezra Stile, Samuel Vaughan, Jr., and others. There are also drafts of some of Cutler's letters.

This letterbook includes documents other than letters, such as "A method of destroying . . . the Wheat Fly," observations on herring, and articles establishing a grammar school at Wilmington (1771).

These letters are to Rev. Theophilus Lindsay and Rev. Thomas Belsham pertaining to natural history, science, and theology.

This collection includes miscellaneous letters and drafts of letters; genealogical notes, medical essays, copies of letters and essays sent to newspapers and magazines; bills and receipts; invitations; military and other commissions; and a biographical memoir of General John Lacey, 1823. There are also papers, principally official, of his son Lieut. B. S. B. Darlington, U.S.N.

These papers include sketches made on a trip to the United States, Canada, and the West Indies; catalogs of objects of natural history, such as fish, animals, insects, and fossils, sent by him to the Museum; and notes.

This journal was kept by Peale as the assistant naturalist of Stephen Long's expedition west of the Rocky Mountains, May 3-August 1, 1819.

These manuscripts include a few letters to John Torrey, Amos Eaton, and Reuben Haines, and journals of travels to the Appalachian mountains (1833), and to the source of the Schuylkill River (1834).