RARE monograph on Otto Weininger`s theories in the light of Immanuel Kant`s philosophy. Otto Weininger (1880-1903) was an Austrian philosopher who in 1903 published the book `Geschlecht und Charakter` (`Sex and Character`), which gained popularity after his suicide at the age of 23. 225x155mm. 96 pages. Blue board Hardcover with cloth spine. Cover and spine age-stained and yellowing. Cover corners rubbed. Bump- and scratch-mark on rear cover. Bottom edge of spine and spine front hinge slightly tattered/peeling. Inner cover slightly age-stained. Rear whitepage upper corner wrinkled. Else in good condition.