Lectures on Art, Delivered Before the University of Oxford in Hilary Term, 1870

Aratra Pentelici, Seven Lectures on the Elements of Sculpture Given before the University of Oxford in Michaelmas Term, 1870

Biology A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907

A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Lecture VI. (of VI.), "Lectures to Working Men", at the Museum of Practical Geolo