Clever Hans / (The horse of Mr. Von Osten): A contribution to experimental / animal and human psychology

Talks To Teachers On Psychology; And To Students On Some Of Life's Ideals

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

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

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

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