Idiots, more especially it would seem idiot girls, tend to show a highly developed hairy system. Thus Voisin, when investigating 150 idiot and imbecile girls, found the hair long and thick and tending to occupy a large surface; one girl had hair on the areolæ of the mamma. (J. Voisin, "Conformation des organes génitaux chez les Idiots," _Annales d'Hygiène Publique_, June, 1894.) It should be said that in idiot boys puberty is late, and the sexual organs as well as the sexual instinct frequently undeveloped, while in idiot girls there is no delay in puberty, and the sexual organs and instinct are frequently fully and even abnormally developed. Hegar has described an interesting case showing an association, of foetal origin, between sexual anomaly and abnormal hairness. In this case a girl of 16 had a uterus duplex, an infantile pelvis, very slight menstruation and undeveloped breasts. She was very hairy on the face, the anterior aspects of the chest and abdomen, the sexual regions, and the thighs, but not specially so on the rest of the body. The hairs were of lanugo-like character, but dark in color. (A. Hegar, _Beiträge zur Geburtshülfe und Gynäkologie_, vol. i, p. III, 1898.) Sometimes hiruties of the face and abdomen begin to appear during pregnancy, apparently from disease or degeneration of the ovaries. (A case is noted in _British Medical Journal_, August 2 and 16, pp. 375 and 436, 1902.) Laycock many years ago referred to the popular belief that women who have hair on the upper lip seldom bear children, and regarded this opinion as "questionless founded on fact." (Laycock, _Nervous Diseases of Women_, p. 22.) When this is so, we may suppose that the abnormal hairy growth is associated with degeneration of the ovaries.