The Tschwi negroes have a proverb to the effect that “no one teaches the smith’s son his trade; when he is ready to work God shows him how”; and I. G. Christaller obtained the following explanation from one of the aborigines: “If you have a trade, and a son who watches you at work, he easily learns it. God has implanted in children the faculty of observing and imitating, and when the son does what he has seen his father do so often it is as if he knew of himself. It is, indeed, God who teaches him!” And this childlike elucidation is not a bad one of the significance of playful imitation in life. The inborn impulse enables a child to learn alone what he either could not do at all or only after painful and wearisome teaching. Imitation is the connecting link between instinctive and intelligent conduct. Thanks to it we can add much to our accomplishments without other instruction, and in a manner agreeable to ourselves, for enjoyment of its exercise is natural, so that, to use the language of the African, it is indeed God who teaches us. The earlier psychologists gave too little attention to imitation. The work of Tarde[528] and Baldwin[529] has first brought to many the knowledge that it is probably destined to win a prominent place in biological psychology, similar to that accorded to the idea of association in the older theories. At any rate these investigators have certainly expanded the common acceptation of the term. Tarde says of a man who unconsciously and involuntarily reflects the bearing of others or accepts outside suggestion, that he is imitating, and he regards such magnified imitation as a special case of the great cosmic law of repetition (ondulation, génération, and imitation are the three forms of “répétition universelle”). Baldwin calls stimulus-repeating repetition in general imitation (so far as it is produced by the organism itself), and so includes the alternate expansion and contraction in the lowest organic forms. According to him, the essence of imitation lies in the fact that when movement follows a stimulus, the stimulus is renewed, giving rise to what may be called “circular” reaction. Imitation of the acts of another individual, from the perception of which a duplicate act results, is a specialized form of this circular reaction. Baldwin has tried to prove that the accommodation of an organism to its environment is a phenomenon of “organic imitation,” and he grounds his new theory of “organic selection” on this principle. I can not here dwell longer on it than to say that it undertakes to mediate in the strife between neo-Darwinism and neo-Lamarckianism, since the survival of the individual with the necessary adaptibility gives selection time to produce hereditary adaptations with the same general trend (selection among coincident variations). Our purpose is best served by confining ourselves to the ordinary use of the term imitation, namely, “The repetition of the acts