The homosexual feeling is an abnormal, congenital manifestation of the cerebral part of the vita sexualis. The essential feature of this manifestation is the want of sexual sensibility for the opposite sex, even to the extent of being inspired with horror by it. This disease must not be confounded with vice. Perversity is not perversion. Sexual acts with the same sex are no proof of the presence of a real perversion. Homosexuality is prevalent in boarding-schools and colleges of both sexes, yet very few or none of these boys or girls are real inverts. Perverse acts occur when obstacles are in the way of natural sexual satisfaction. When the obstacles are removed the individuals return to normal sexual functions. The perversity of homosexual acts is very common. Even among domesticated animals it is easy to find evidences of homosexual attraction in the absence of the other sex. Male dogs, rams and bulls, when isolated, become restless and attempt conjugium together. Male monkeys when long kept away from their females will try conjugium. Female monkeys behave in a sexual way to each other. Deville found that female dogs, when isolated, become restless, and when in the state of sexual excitement attempt conjugium. The presence of the opposite sex restores at once normal conditions. In cows the sexual desire is often directed to the same sex. Buffon observed that the females of doves or other birds when set together would soon begin to have conjugium among themselves. Bailly-Maitre, a breeder of great knowledge, wrote to Girard that the Belgian carrier-pigeons are strange creatures in their manners. Conjugium between males and still more frequently between females often occurs at an early age, up to the second year. Among hens and ducks it has been occasionally observed by the author that the female assumed male sexual tendencies. Following the example of their animals, savages are extensively addicted to homosexuality. Homosexuality has been found among almost all the American Indian tribes. In some of these tribes the homosexual practices are a part of their religious ceremonies. For this purpose, a strong man is chosen who jugiter manibus stupratur for hours every day and is also forced to ride horseback in his free time, until in the course of time virilia are degenerated, and he becomes entirely effeminate. He is then dressed in female clothes and made to do feminine work among the women of the village. This androgynos is then used as homosexual pathicus at the annual religious ceremonies. In Bali homosexuality is common among men and women. The method of gratification adopted among the latter is either digital or lingual, or else by bringing the parts together (tribadism proper). In Zanzibar the negro women, in addition to tribadism and cunnilingus, sometimes use an ebony or ivory phallus to which not seldom a kind of glans is appended. Some have a longitudinal perforation through which warm water can be injected.