depriving of life or liberty the unfortunate victims of such propensities. Again, if the mental and moral qualities of the lower animals differ from those of man, not in kind, but only in degree, and the human mammal is descended from a stock of primates, to which apes and bats belong, and dogs and cats and pigs are more remotely akin, it is difficult to determine the point at which moral and penal responsibility ceases in the descending, or begins in the ascending scale of being. That beasts and birds and even insects commit acts of violence, which in human agents would be called crimes, and which spring from the same psychical causes and, as we have shown in another work (_Evolutionary Ethics and Animal Psychology._ New York: D. Appleton and Co.; London: William Heinemann, 1898), are punished by the herd, the flock or the swarm in a more or less judicial manner, is undeniable. The zoöpsychologist Lacassagne divides the criminal offences of animals into six classes or categories, the ground of the classification being the motives which underlie and originate them. The lowest or most rudimentary motive to crime in both man and beast is hunger, the operation of which is seen in the spectacle of one savage killing another in order to get sole possession of a wild beast slain by them in common, and in the ferocity of two dogs fighting over a bone. Perhaps the great majority of crimes afflicting society at the present time have their origin in this source. Next to the desire of the individual to preserve himself comes the desire to preserve his kind; this motive is commonly considered a more generous impulse and is praised as parental affection. This earliest and most primitive of altruistic emotions is exceedingly strong in the lower animals, especially in those whose offspring are comparatively helpless in infancy, as is the case with all species of monkeys, and manifests itself not only in tender care of the young, but also in theft, robbery, and other acts of violence committed for their sake. The wanton love of destruction characterizes both beasts and men; there are roughs and vandals among the former as well as among the latter, who take a malicious delight in doing injury to persons and property. Vanity and the desire of “showing off” play no small part in the wrongdoings of apes and apish men and women. Other incentives to crime are ambition, sexual passion, gregariousness, the concentrated egoism and merciless brutality of a crowd even in the most civilized communities, the outrages so recklessly perpetrated by what a French jurist, M. Tarde, calls “that impulsive and maniac beast, the mob.” It may be remarked, too, that the kinds of criminal actions, which civilization tends to diminish among men, domestication tends to diminish among the lower animals.