Diaries, lecture notes, personal accounts, a thesis, photographs, and pamphlets. Includes diaries of Caldwell and his wife, and of George W. Chamberlain, his son-in-law who was a professor of architecture at Cornell; notes kept by Caldwell on Louis Agassiz's lectures; family photographs, clippings, and letters, and an elaborate set of financial accounts kept by Caldwell. Typescript of a vacation journal, 1855.