The Daniel Coit Gilman Collection is divided into three series: I. Correspondence. II. Writings. III. Special Files.
SERIES I, CORRESPONDENCE is arranged alphabetically by the name of the writer of the letter; letters written by Gilman are filed under the name of the person to whom they are addressed. Among the notable correspondents are: Charles M. Andrews, James Dwight Dana, William Henry Brewer, Timothy Dwight, Benjamin Silliman, Elisha Mulford, Moses Coit Tyler, Theodore Dwight Woolsey, Justin Smith Morrill, Josiah Gibbs, and Andrew Dickson White. Of special interest are those letters he wrote, mostly to his sister, Maria P. (Mollie) Gilman, during his travels in Europe from 1853 to 1855. In addition, there are a number of letters addressed to Gilman as the representative from Connecticut to the Universal Exposition at Paris in 1855.
SERIES II, WRITINGS contains both manuscript and printed articles, notes, and addresses pertaining to industrial, agricultural, and general themes in education, as well as materials relating to the history of higher education, both European and American. Of special interest is a series of lectures he gave at the University of California at Berkeley in 1883. There are also a number of biographical sketches of philosophers and scientists, and some material relating to Gilman's activities in behalf of the Yale Library and the Sheffield Scientific School.
SERIES III, SPECIAL FILES contains both manuscript and printed materials pertaining to the Sheffield Scientific School, the Winchester Observatory, the Yale Corporation, as well as newspaper articles written by Gilman as a means of defraying a part of his expenses during his European excursion of 1854-1855.