This is a small group of letters written to Johann Ambrosius Beurer, J. von Sprehelson, and Christoph Jacob Trew.

This journal pertains to his travels in the eastern part of the United States.

This volume was copied by Philip Holbrook Nicklin, a Philadelphia author and bookseller, from portions of the "London Quarterly Journal of Science Literature and the Arts" and partly from a translation of the original, to which is prefixed a short conchological introduction, containing descriptions of the Linnean genera, & of those species, from which Lamarck has formed most of his genera.

This volume, written between May 3 and December 2, includes essays on mineralogy, the vegetable kingdom (such as botany and fruitification), and the animal kingdom (such as zoology, ornithology, and generation of animals).

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

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 is a recording of Fowler's remembrances of Philadelphia naturalists who were affiliated with the Academy of Natural Sciences of Philadelphia, where he worked. Fowler remembers Edward D. Cope and Samuel N. Rhoads in particular.

Essays on topics in natural history and zoology, including advantages of studying natural history, with corrections by the author.

These manuscripts are lists and descriptions of plants.

These letters relate to natural history and birds.

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

These letters and papers include eighteen letters, concerning botany, from John Eatton LeConte (1816-1829).

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.

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

This classification is made on the plan presented in the "Encyclopedia Britannica," and includes genera and species not included there, especially of North America and particularly the fresh water fish of Pennsylvania and New York states, ca. 1866-1879. Also included are many illustrations of specimens.