to professional men generally, and in this general professional class there are subdivisions, so that every professional man instinctively recognises his fellows. It is so among criminals. Mr. Davitt sketches, for instance, the special class of “hooks,” or professional pickpockets, “so well outlined in gait, constant use of slang, furtive looks, almost total want of tact in their ordinary conduct, with an instinctively suspicious manner in almost all their actions, that they are as easily distinguishable from the other criminals of a prison as they are recognisable to their constant pursuers, the police, when abroad in the world.” If we were to look at the matter in a rather more thorough and scientific manner, there can be no doubt that the previsions of Tarde would be justified, and that men would fall into certain natural anthropologic groups, according to their habitual modes of feeling and thinking and acting, the nature of each person, to some extent, “subdued to what it works in, like the dyer’s hand.” In each class there would be different degrees in sensory perception, in cranial shape and size, in muscular development. Such investigations will no doubt be systematically carried out in time. At present, owing to the extraordinary apathy of anthropologists, and consequently the general indifference to the importance of studies connected with the development and varieties of men, scarcely anything is known regarding the matter. But important as professional selection is, it cannot account for everything. Indeed no serious attempt has been made to substantiate it by reference to the details of criminal anthropology. M. Tarde is a magistrate; no scientific man would have attempted to account for all the facts that have now accumulated by professional selection and acquired habits.