Consists of material chiefly on natural history, shells, and insects, including miscellaneous notes on conchology by Say; photostats of 6 letters from Say to Jacob Gilliams, 1819-1829, from Morristown, New Jersey; and a biographical note on Say. The drawings and impressions of shells are by Mrs. Lucy Way Sistaire Say, prepared for W. G. Binney's edition of Say's complete works on conchology, 1858; also Mrs. Say's refutation of what she considered an unfair attack in George Ord's memoir of Say. Correspondents include André Etienne Férussac, Arthur F. Gray, John Lawrence LeConte, and Charles W. Short. An additional item is a memorial volume (ca. 150 pp.), including a family genealogy and land surveys in watercolor (B Sa95f).

This collection consists of correspondence to Bonaparte from American scientists regarding ornithology, zoology, and specimens.

This collection includes letters to Maclure, journals of travel in Europe and America, notes and essays. Also included are manuscripts, transcripts, and notes relating to Maclure.

These papers reflect Isaac Hays' interests and activities in the medical profession and as an editor. His interest in paleontology, especially in the controversy with G. W. Featherstonhaugh, is also represented. There is one separate volume (77 letters) containing correspondence about natural history and naturalists, written to Hays by C. L. Bonaparte, George Ord, Thomas Say, and Charles A. Lesueur. The correspondence in the larger collection, however, contains much material on the American Journal of the Medical Sciences, particularly illuminated in the correspondence with John D. Godman. The I. Minis Hays material consists of letters from doctors, relating to medicine and medical publications and editing, as well as medical organizations. Most significant of the correspondence is that with John Shaw Billings (ca. 60 letters).