than with that of ethics; hence we find that the authors of books directed against it are physicians (e.g., Tissot and others) rather than moralists. After dietetics and hygiene have done their work, and struck it down by irrefutable reasoning, if Ethics desires to take up the matter, she finds little left for her to do. Bestiality, again, is of very rare occurrence; it is thoroughly abnormal and exceptional, and, moreover, so loathsome and foreign to human nature, that itself, better than all arguments of reason, passes judgment on itself, and deters by sheer disgust.

For the rest, as being a degradation of human nature, it is in reality an offence against the species as such, and in the abstract; not against human units. Of the three sexual perversions of which we are speaking it is consequently only with