This correspondence is with Charles Francis Adams, Jr., Edgar Fahs Smith, and Thomas Sovereign Gates, about undergraduate days at Harvard College, his interest in Harvard, the University of Pennsylvania, and the Wistar Institute. The papers include a list of publications, biographical data, papers on Robert G. LeConte and Daniel Moreau Barringer, a certificate of membership in the Governor Thomas Dudley Family Association, and 25 drawings of crystals and 35 original sketches made to accompany his Harvard thesis, "The Nature and Origin of Deposits of Phosphate of Lime."

Beginning with his college life as an undergraduate at Harvard (1905-1906), Morley's diaries continue through his earliest travels and explorations of Central America (1907-1944), with information on the study of Mayan hieroglyphs, publications, the study of Central American ruins, and the manners and customs of the jungle Indians. Five volumes are devoted to four separate archaeological expeditions: Copan expedition (1937), Uxmal expedition (1941-1942), Central American expedition (1944), and Guatemala and Honduras expedition (1947). Formal and detailed field notes form the bulk of Morley's archaeological work. There are no diaries for 1908-1911, 1913, 1926-1930, 1933-1936, 1938-1940, and 1943.