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

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

Text Book of Biology, Part 1: Vertebrata

The Principles of Masonic Law / A Treatise on the Constitutional Laws, Usages and Landmarks of / Freemasonry

Five Stages of Greek Religion

Christianity and Greek Philosophy / or, the relation between spontaneous and reflective thought / in Greece and the positive teaching of Christ and His / Apostles

Dialogues Concerning Natural Religion

A History of Indian Philosophy, Volume 1

Elements of Chemistry, / In a New Systematic Order, Containing all the Modern Discoveries

The Economist

The Will to Doubt / An essay in philosophy for the general thinker