=Influence of the Race on Sexual Life.=--If I were an ethnographer I should attempt to establish whether, and in what way, racial differences affect the sexual life of man; but the question is so delicate that it would require a skilled specialist to settle it. With the exception of the pages dealing with the history of extra-conjugal intercourse, the statements in this chapter are based on the work of Westermark. The chief difficulty consists in separating, in the customs of each race, that which arises from habit and historical tradition from that which depends on more or less specific hereditary peculiarities. It is here very easy to fall into error in formulating false conclusions. A good deal has been said concerning the hot blood of warm climates, and on the whole it appears true that people who inhabit these climates have a more violent and more precocious sexual temperament than those who live in cold regions. But this is not a racial character. The Jews, who have preserved their race unaltered in all climates and under all possible conditions of existence, furnish an object lesson which is particularly appropriate to decide the question. The traits of their character are reflected in their sexual life. Their sexual appetites are generally strong and their love is distinguished by great family attachment. Their sexual life is also influenced by their mercantile spirit, and we find them everywhere connected with the traffic of women and prostitution. They are not very jealous and are much addicted to concubinage, at the same time remaining affectionate to their wife and family. The Mongols also lead a very intense sexual life. Among the polyandrous people of Thibet jealousy appears to be completely absent: this may be the result of custom or may be due to phylogenetic instinct. The Mormons, who are descended from monogamous races, confirm the idea that polygamy is not a specific racial character. It would be interesting to study the mixed races of North America from this point of view. At first sight, it seems that the Americanization of customs in the mixture of races of the United States is also extended to sexual life, and that we cannot discover the fundamental differences between the Irish, Scandinavians, French, Germans and Italians who constitute this mixture. But it is possible that this is only a superficial impression, and that a deeper study of the details would lead to another result. One thing appears to be unquestionable in the negro race; that is the violence of its sexual passion combined with its mental inferiority.