That jealousy is independent of sex is shown by its intensity in children, and by the fact that very jealous people are jealous of everybody without regard to relationship or sex, and cannot bear to hear the person they "love" speak favorably of anyone under any circumstances (many women, for instance, are much more jealous of their husbands' mothers and sisters than of unrelated women whom they suspect him of fancying); but it is seldom possible to disentangle the two passions in practice. Besides, jealousy is an inculcated passion, forced by society on people in whom it would not occur spontaneously. In Brieux's Bourgeois aux Champs, the benevolent hero finds himself detested by the neighboring peasants and farmers, not because he preserves game, and sets mantraps for poachers, and defends his legal rights over his land to the extremest point of unsocial savagery, but because, being an amiable and public-spirited person, he refuses to do all this, and thereby offends and disparages the sense of property in his neighbors. The same thing is true of matrimonial jealousy; the man who does not at least pretend to feel it and behave as badly as if he really felt it is despised and insulted; and many a man has shot or stabbed a friend or been shot or stabbed by him in a duel, or disgraced himself and ruined his own wife in a divorce scandal, against his conscience, against his instinct, and to the destruction of his home, solely because Society conspired to drive him to keep its own lower morality in countenance in this miserable and undignified manner. Morality is confused in such matters. In an elegant plutocracy, a jealous husband is regarded as a boor. Among the tradesmen who supply that plutocracy with its meals, a husband who is not jealous, and refrains from assailing his rival with his fists, is regarded as a ridiculous, contemptible and cowardly cuckold. And the laboring class is divided into the respectable section which takes the tradesman's view, and the disreputable section which enjoys the license of the plutocracy without its money: creeping below the law as its exemplars prance above it; cutting down all expenses of respectability and even decency; and frankly accepting squalor and disrepute as the price of anarchic self-indulgence. The conflict between Malvolio and Sir Toby, between the marquis and the bourgeois, the cavalier and the puritan, the ascetic and the voluptuary, goes on continually, and goes on not only between class and class and individual and individual, but in the selfsame breast in a series of reactions and revulsions in which the irresistible becomes the unbearable, and the unbearable the irresistible, until none of us can say what our characters really are in this respect. THE MISSING DATA OF A SCIENTIFIC NATURAL HISTORY OF MARRIAGE.