As children become physically differentiated in respect of sex, so also does a mental differentiation ensue. Differences are observed in the matter of occupation, of games, of movements, and numerous other details. Since man is to play the active part in life, boys rejoice especially in rough outdoor games. Girls, on the other hand, prefer such games as correspond to their future occupations. Hence their inclination to mother smaller children, and to play with dolls. Watch how a little girl takes care of her doll, washes it, dresses and undresses it. When only six or seven years of age she is often an excellent nurse. Her need to occupy herself in such activities is often so great that she pretends that her doll is ill. In all kinds of ways, we see the little girl occupying herself in the activities and inclinations of her future existence. She practices house work; she has a little kitchen, in which she cooks for herself and her doll. She is fond of needlework. The care of her own person, and more especially its adornment, is not forgotten. I remember seeing a girl of three who kept on interrupting her elders' conversation by crying out, "New clothes!" and would not keep quiet until these latter had been duly admired. The love of self-adornment is almost peculiar to female children; boys, on the other hand, prefer rough outdoor games, in which their muscles are actively employed, robber-games, soldier-games, and the like. And whereas, in early childhood, both sexes are fond of very noisy games, the fondness for these disappears earlier in girls than in boys.