A Popular History of the Art of Music / From the Earliest Times Until the Present

Symbolic Logic

Secret Diplomatic History of The Eighteenth Century

Taboo and Genetics / A Study of the Biological, Sociological and Psychological Foundation of the Family

An Elementary Study of Chemistry

Criminal Sociology

The Einstein Theory of Relativity

The Psychology of Revolution

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

A History of the Japanese People / From the Earliest Times to the End of the Meiji Era

Maxims and Reflections