Popular Education / For the use of Parents and Teachers, and for Young Persons of Both Sexes

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

Religion and Lust / or, The Psychical Correlation of Religious Emotion and Sexual Desire

The Sex Side of Life / An Explanation for Young People

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

Sex = Love, And its Place in a Free Society

The Beautiful / An Introduction to Psychological Aesthetics

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

The God-Idea of the Ancients / or Sex in Religion

How to Become Rich / A Treatise on Phrenology, Choice of Professions and Matrimony

The Positive Outcome of Philosophy / The Nature of Human Brain Work. Letters on Logic