The third method of preventing propagation is castration. Sterilization does not deprive the individual of his desire for congressus nor of the ability to perform the same, nor of the faculty of experiencing libido. Hence the murderous and erotically degenerated criminal classes will remain a menace to society until they are deprived not only of the potency of procreation but also of the potency concarnationis and of experiencing libido. The method of castration, therefore, should be reserved as a penalty for the outspoken habitual brutal criminal, the rapist, the confirmed inebriate, the incorrigible burglar or gunman, the gibbering idiot, or imbecile cretin with the inherited tendency to crime, and the unstable erotopath. The offspring of this class are predestined to be degenerates, and one of the two operations is imperatively indicated. It is preferable that the testicles or ovaries should perish in such individuals than that their morbidity should be propagated. In the interest of the patients themselves the more radical operation is to be recommended. Spayed animals are always easier controlled. Just as gelding of the bull and stallion changes the vigorous, powerful, spirited animals into the comparatively quiet, docile ox and horse, so may the unsexing or castration of the unfit have a beneficial quieting effect upon the ferocious, currish, stupid human semi-animal.[CK] The defectives, when at large, will always find mating facilities even with the healthy, and thereby drag fresh blood into the vortex of disease. The progeny of defective parentage are always defective. Two imbecile parents will never produce a perfectly normal child. A superior mated with an inferior may sometimes reproduce the normal, but, as a rule, the progeny of this crossing will also be defective. The eradication of every kind of degeneracy is hence the solemn duty of society to relieve the burden of the community, and by the reduction of the lower types in each successive generation, degeneracy could be weeded out of human society. The other method of the realization of a superior humanity is the positive breeding of superior offspring. But this method of the stock-farm is so antagonistic to our conception of personal liberty that any liberty-loving nation will prefer panmixia or blood-chaos, with the freedom to choose their mates by means of love or even infatuation, to the patriarchic slavery of being mated like race-horses.[CL]