Letters to Edward Williams Morley (1838-1923), chemist and physicist, from his father, Sardis Brewster Morley (1804-1889), Congregational clergyman in Massachusetts and Connecticut, his mother, Anna Clarissa (Treat) Morley, brothers John Henry Morley, Congregational clergyman in the Midwest, and Frank Gibson Morley (d. 1875), and sister, Lizzie Morley; together with correspondence between the other members of the family; letters to Sardis Brewster Morley from classmates at Williams College, many relating to theological questions; other family papers; and reprints of Edward Williams Morley's scientific writings, including those relating to the Michelson-Morley experiment. Includes Civil War letters of Sardis Brewster Morley (a chaplain), John Henry Morley, and Frank Gibson Morley; letters by Lizzie Morley written from Mount Holyoke Female Seminary and Dio Lewis's School for Young Ladies at Lexington, Mass., letters from John Henry Morley in Magnolia, Iowa, Sioux City, Iowa, and while superintendent of Congregtional Home Missionary Society in Minneapolis, Minn.; family chronology (1864-1885) kept by Anna Clarissa (Treat) Morley; and Treat family papers.