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

The World's Greatest Books — Volume 14 — Philosophy and Economics

The Philosophy of the Moral Feelings

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

The Mystic Will. A Method of Developing and Strengthening the Faculties of the Mind, through the Awakened Will, by a Simple, Scientific Process Possible to Any Person of Ordinary Intelligence

The Psychology of Nations / A Contribution to the Philosophy of History