The Natural Philosophy of Love

The Renewal of Life; How and When to Tell the Story to the Young

Margaret Warner Morley

The Works of Aristotle the Famous Philosopher Containing his Complete Masterpiece and Family Physician; his Experienced Midwife, his Book of Problems and his Remarks on Physiognomy

Essays Upon Heredity and Kindred Biological Problems Authorised Translation

August Weismann

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

Winfield Scott Hall

Physique de l'Amour: Essai sur l'instinct sexuel

Remy de Gourmont

Über den Bildungstrieb

Johann Friedrich Blumenbach