There is superfluity of examples showing that odors of the body may become fetiches. This fact is also taken advantage of in the _ars amandi_ of woman, either consciously or unconsciously. Ruth sought to attract Boaz by perfuming herself. The _demi-monde_ of ancient and modern times is noted for its use of perfume. Jäger, in his “Discovery of the Soul,” calls attention to many olfactory sympathies. Cases are known where men have married ugly women simply because their personal odors were exceedingly pleasing. Binet makes it probable that the voice may also become a fetich. He relates a case in point of Dumas, who used it in his novel, “La Maison du Vent.” It was the case of a wife who fell in love with a tenor’s voice, and thus became untrue to her husband. Belot’s romance, “Les Baigneuses de Trouville,” speaks in favor of this assumption. Binet thinks that many marriages with singers are due to the fetich of their voices. He also calls attention to the interesting fact that among singing-birds the voice has the same sexual significance as odors among quadrupeds. The birds allure by their song, and the male that sings most beautifully flies at night to his charmed mate. The pathological facts of masochism and sadism show that mental peculiarities may also act as fetiches in a wider sense. Thus the fact of idiosyncrasies is explained, and the old saying, “_De gustibus non est disputandum_,” retains its force. II. PHYSIOLOGY. During the time of the physiological processes in the reproductive glands, desires arise in the consciousness of the individual which have for their purpose the perpetuation of the species (sexual instinct). Sexual desire during the years of sexual maturity is a physiological law. The duration of the physiological processes in the sexual organs, as well as the strength of the sexual desire manifested, vary, both in individuals and in races. Race, climate, heredity, and social circumstances have a very decided influence upon it. The greater sensuality of southern races as compared with the sexual needs of those of the North is well known. Sexual development in the inhabitants of tropical climes takes place much earlier than in those of more northern regions. In women of northern countries ovulation, recognizable in the development of the body and the occurrence of a periodical flow of blood from the genitals (menstruation), usually begins about the thirteenth or fifteenth year; in men puberty, recognizable in the deepening of the voice, the appearance of hair on the face and the mons veneris, and the occasional occurrence of pollutions, etc., takes place about the fifteenth year. In the inhabitants of tropical countries, however, sexual development takes place several years earlier in women,—sometimes as early as the eighth year.