—— Die Fortschritte des Darwinismus. Cöln, 1874, 8vo.
Stebbing, Thomas R. R.—Darwinism. A lecture delivered before the Torquay Natural History Society, February 1, 1869. London, 1869, 8vo.
—— Darwinism.—The Noachian Flood. A lecture delivered before the Torquay Natural History Society, January 31, 1870. London, 1870, 8vo.
—— Essays on Darwinism. London, 1871, 8vo.
Stephen, Leslie.—Essays on Freethinking and Plain speaking. London, 1873, 8vo.
Darwinism and Divinity, pp. 72-109.
—— Life of Henry Fawcett. London, 1885, 8vo.
Charles Darwin, pp. 98-102 and 239.
Strümpell, Ludwig.—Die Geisteskräfte der Menschen verglichen mit denen der Thiere. Ein Bedenken gegen Darwin’s Ansicht über denselben Gegenstand. Leipzig, 1878, 8vo.
Suckling, H.—Anti-Darwin: or some reasons for not accepting his hypothesis. By the author of “Ceylon, ancient and modern” [H. Suckling]. Twickenham, 1884, 16mo.