The papers of Marcellus W. Darling are comprised of seventy-eight items dating from 1862 to 1911. The majority of the papers relate to his service in Company K, 154th New York Volunteer Infantry during the Civil War. Included are approximately forty letters that he wrote home during the war, and a diary from 1864. The rest of the collection is made up of memoirs, genealogical data, and a book of quotes and sayings by Marcellus Darling.