In many persons the impulses of childhood persist in a more or less subdued form in adult age. The impulses are not yielded to so readily, or at all, but they are still felt. The examples have often been quoted of the distinguished alienist, Morel, who, as he narrates himself, seeing a workman leaning over one of the Seine bridges, felt so strong an impulse to throw the man into the river, that he had to rush away from the spot; and of Humboldt’s nurse, who, at the sight and touch of the new-born child’s rosy flesh, felt the temptation to kill it, and was obliged to entrust it to some one else. These morbid impulses are perhaps more closely related to insanity than to criminality, but it is on a borderland that is common to both. Both child and criminal are subject to such impulses. In the criminal, we may often take it, there is an arrest of development. The criminal is an individual who, to some extent, remains a child his life long--a child of larger growth and with greater capacity for evil. This is part of the atavism of criminals. Mental acuteness is often observed among criminal children; it is rare among criminal adults. There is evidently arrest of development at a very early age, probably a precocious union of the cranial bones. Among savages, also, the young children are bright, but development stops at a very early age. All who have come very intimately in contact with criminals have noted their resemblance to children. Thus that profound and sympathetic observer, Dostoieffsky, in his _Recollections of the Dead-House_, summing up some of the light-hearted, easy-going characters of the convicts, says: “In one word they were children, true children, even at forty years of age.” And elsewhere he quotes a saying concerning the exile: “The convict is a child; he throws himself on everything that he sees.”