Mohammedanism / Lectures on Its Origin, Its Religious and Political Growth, / and Its Present State

The Biology, Physiology and Sociology of Reproduction / Also Sexual Hygiene with Special Reference to the Male

Text Book of Biology, Part 1: Vertebrata

Five Stages of Greek Religion

Biographical Stories / (From: "True Stories of History and Biography")

Physics and Politics, or, Thoughts on the application of the principles of "natural selection" and "inheritance" to political society