These letters concern various scientific subjects, such as fishes, insects, snakes, mice, fossils, and mosses. Other subjects include learned institutions, notably the Smithsonian Institution and the Academy of Natural Sciences of Philadelphia, and men of science. Correspondents include S. S. Haldeman, Walter J. Hoffman, Spencer F. Baird, Edward D. Cope, and Leo Lesquereux.
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Academy of Natural Sciences of Philadelphia | Botany. | Cresson, Ezra Townsend | Durand, Elie M. | Le Conte, John L. (John Lawrence), 1825-1883 | Learned institutions and societies. | Natural history. | Paleontology. | Science and technology | Scientific Correspondence | Scientists. | Smithsonian Institution | Stauffer, Jacob,b. 1808. | Zoology.