Before going on to investigate this playful rivalry it may be useful to inquire into its social significance. G. Tarde, in his interesting sociological study, Les lois de l’imitation,[404] attempts to prove that imitation is the mainspring of social evolution. But along with the peaceful operations of imitation, the fighting instinct, too, makes itself felt in manifold ways, as a principle of progress (as I remarked above in discussing combativeness), in conjunction it is true with imitation and usually under the form of rivalry. It is evident that social progress would be slow indeed if men only imitated and never opposed what is done in their presence. Rivalry in ownership, power, and authority is the force which urges each to do his utmost in the struggle for life, and which has produced the most advanced civilizations. A people without ambition is lost; not merely stationary, but actually decadent. As in art bald imitation of even the best models results in weakness, so in society. Men must will to do better in order to do as well. In spite of their variety we can very quickly review the physical imitative games, since under movement-plays we have already noticed a considerable number belonging to this class, and since it is their psychological side alone that chiefly appeals to us. The following examples, then, are merely chosen to show by means of their variety the great importance of imitation in human play.[405] Children learn most of their bodily movements by such play in a way which clearly illustrates the mingled effects of imitation and emulation. When one child jumps off the second step, another child who sees him immediately tries to cover three; and when boys are practising their leaps each makes a mark in the sand beyond the others as his goal. To lift a heavier weight, to throw farther, to run faster, to jump higher, to make a top spin longer, to stay longer under water, to shoot higher, farther, and with better aim than his comrades can, is the burning wish of every childish heart. In order to see the same enthusiastic rivalry in physical prowess exhibited by adults, we must turn to the half-civilized peoples to whom such acquirements are of surpassing value in the struggle for life. Among the ancient Germans, for example, such contests were carried to the highest degree of perfection, and, in spite of their avowedly playful character, conducted with such seriousness that they often became matters of life and death. Skill, prowess, and endurance in leaping, running, lifting and throwing huge stones, the use of bow and arrow, diving and swimming, riding and rowing, were all the subjects of contest, and each victor sought to surpass the achievements of the former one. All warlike peoples of whom ethnology is cognizant show much the same picture, and highly civilized nations, too, accord an important position to athletic contests, as the Greek and Roman games bear