..A lecture delivered ... before the Free Religious Association (Free Thinkers) of Boston, in Horticultural Hall, on Sunday afternoon, February 13, 1876. Carefully revised by the author. Original lecture in Connolly Miscellanies, vol. 25.

Discussion club text, based on lectures given in Chicago, 1959.

..before the Y.M.C. Philopatrian Literary Institute, of Wilmington, Delaware.

Reprinted Nov. 23, 1893 from the Proc. Amer. Philos. Soc., vol. 32.

Brittle paper.

..delivered by Hon. Edmund F. Dunne, Chief Justices of the Supreme Court of Arizona, in the hall of House of Representatives of the Territorial Legislature of Tucson, February, 1875. San Francisco ed. in Gibbons file.