- How Religion Arises: A Psychological Study
- Landmarks of Science, from Columbus to Spencer: How We Got the Greatest Truths Told in Biographical Chapters, the Places Where History Turns
- A Receivership For Civilization: From Biblical Church With Its Primitive World And Jewish Legends To Aryan Science With Its Infinite Universe And Established Facts
- The Classification of Religions: Different Methods, Their Advantages and Disadvantages
- The Human Races: A Sketch of Classifications, a Chapter in Anthropology












