- 1Chapter I — The Subject of an Idea
- 2Chapter II — The Aim of Life
- 3Chapter III — Scale of Sexes
- 4Chapter IV — Sexual Dimorphism
- 5Chapter V — Sexual Dimorphism
- 6Chapter VI — Sexual Dimorphism
- 7Chapter VII — Sexual Dimorphism and Feminism
- 8Chapter VIII — Love-Organs
- 9Chapter IX — The Mechanism of Love
- 10Chapter X — Mechanism of Love
- 11Chapter XI — The Mechanism of Love
- 12Chapter XII — The Mechanism of Love
- 13Chapter XIII — The Mechanism of Love
- 14Chapter XIV — The Mechanism of Love
- 15Chapter XV — The Sexual Parade
- 16Chapter XVI — Polygamy
- 17Chapter XVII — Love Among Social Animals
- 18Chapter XVIII — The Question of Aberrations
- 19Chapter XIX — Instinct
- 20Chapter XX — Tyranny of the Nervous System
- 21Translator’s Postscript
- 22Bibliography
The Natural Philosophy of Love
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