Largely correspondence of Samuel M. Janney with family and with friends such as John Comly, Joseph Dugdale, Benjamin Ferris, William Dudley Foulke, Isaac T. Hopper, Halliday Jackson, Horace W. Mann, James and Lucretia Mott, Edward Parrish, Moses Sheppard, and George M. Truman. The collection includes letters written during the period of the Civil War and during the period of Janney's Indian Superintendency, also letters of members of his family to one another, his manuscript journal (published 1881 as Memoirs), sermons and essays, manuscripts for his History of the Religious Society of Friends, vol. III, vol. IV , The Life of George Fox; with a Dissertation on the Views of George Fox concerning the Doctrines of the Christian Church, and The Life of William Penn. Also his Day Book, 1825-1856.