Originally published in Berlin in 1920. The Austrian author was a "poet - philosopher", whose conception of the development of love must rank with the most daring speculations in early psychology. He develops the theory that love is not a primary instinct, but has been gradually evolved in historical time. Lucka distinguishes three great stages in the evolution of love: The Sexual Instinct - Love, including the deification of women and perversions of metaphysical eroticism - The Blending of Sexuality and Love. He concludes with thoughts on the Psychogenetic Law. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. Home Farm Books are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.