This dissertation reveals how Joseph Henry's teaching related to his research, and how it reflected his overall scientific outlook and affected developments in physics.

This collection contains material relating to his legal affairs, medical publications, receipts for books purchased, and information on botany. Important correspondents include Edward H. Clarke, George Mifflin Dallas, Samuel David Gross, and Joseph Henry. There is also family history in these papers.

The letters in this small collection concern the Smithsonian Institution, the Colorado Territory, and Humboldt's observations, among many other topics.

These are primarily papers relating to the work of the United States Army Corps of Topographical Engineers, with special reference to surveys of harbors of the eastern United States. Some papers and letters relate to natural history and are addressed to John Lawrence LeConte. Correspondents include Rutherford B. Hayes, Joseph Henry, Daniel Parker, and E.G. Squier.

This collection contains professional and personal correspondece, as well as some personal business accounts. The topics mentioned range from general ornithology to specific birds, particularly of the West Indies and South America; bird illustrations and various publications; paleontology, and zoology.

This item contains much information about his various posts and about conflicts, personalities, and the politics of science. There are also many references and comments about scientific technology of the day, and of such people as Matthew F. Maury. There are numerous letters to A. D. Bache, James Henry Coffin, Charles Henry Davis, and William H. Willcox.

This is primarily a collection of letters, with some additional documents, concerning Young's interest in botany, geology, mineralogy, and natural history. There is information about Bowdoin College, where he studied under Parker Cleaveland. There is also much on the natural history of Maine, where he was the State Botanist in 1847-1849, and also on the Bangor Natural History Society. There are materials on Brazil in relation to Young's service there as the U.S. consul to Rio Grande do Sul from 1863 to 1873. There are also letters from his brother, John C. Young, and his sister, Sarah Augusta Young.

This correspondence concerning the survey of western lands was received by the United States Geographical and Geological Survey of the Rocky Mountain Region. Also includes a selection of letters sent by the Survey (1876-1878).

Mentioned in these letters are personal affairs, experiments, Babbage's calculating machine, and his "Bridgewater Treatise," second edition.

The manuscripts of father William Mitchell and daughter Maria Mitchell are not easily separated, and are treated here together. The collection includes William Mitchell's autobiography, his memoir of Judge Walter Folger of Nantucket, astronomical and meteorological observations, lectures, family and other correspondence.