treatises of Ball and of Binet, and in popular works, examples of the transformation of any sensation whatsoever into sexual act. Here there are no categories, the field is unlimited. Men have been known for whom the smell of rotten apples gave strong and necessarily sexual emotions. Schiller always kept a stock in his table drawer; but, as he possessed a refractory passage in which the emotional currents were in large part broken, he made verses, when he had inhaled them, instead of making love. Here, then, we have a whole class of men in whom the emotions, arrested halfway, are transformed into intelligence, into aesthetic taste, into religious feeling, into morality, into cruelty, according to the environment and the circumstances, and according to an exceedingly obscure system of dynamics. It may even be said that this transformation of the emotions takes place, more or less, in all men. The emotions may chance also to react almost equally in all directions, a notable part travelling towards the genital centres while enough remains _en route_ to produce a great philosopher, a great artist, a great criminal. Love seems peculiarly connected with cruelty, either by its absence or by its excess. The mimetic of cruelty is precisely that of sexual love. Duchenne of Boulogne has proved that by his experiments. In types of men like Torquemada or Robespierre, the emotions do not reach the genital sense. They encounter an obstacle which shunts them off towards another centre. Instead of being transformed into the need for reproduction, they are transformed into the need for destruction. But there is the Neronian type and there is the Sadie type, in which sexuality and cruelty become exasperated simultaneously and are intertangled. There are men capable of stronger emotional shocks than other men. Though divided and distributed towards two goals, the current remains strong enough to produce acts of great intensity. The same phenomenon, though in a less sinister form, appears when intellectual power comes into play simultaneously with genital power. Every man capable of emotion is capable of love, and at the same time, either of cruelty, of intellectuality, or of religious sentiment; but the emotional current is sometimes entirely absorbed by one of the human activities, and we have one variety of extreme types, the other variety being furnished by men of a great emotional receptivity and, consequently, of a great diversity of aptitudes.