appears to me to be the one insurmountable objection among the many which he and others have brought against the conception of imitative instinct, and it is serious enough to cause me to modify my former position. As a point of departure, suppose we take the assumption that, with certain limitations, a psychophysical adjustment, not in the ordinary sense instinctive, accounts for the genesis of imitation. This adjustment depends on the fact that in conscious activity a necessary connection exists between the movement produced and the antecedent concept of the movement. On the one hand, then, a movement is said to be voluntary only when the motor act is accompanied with such an idea of movement, while the other view implies that the idea itself is the thing which urges its own fulfilment.[535] If this is so, the mere concept of the movement performed by another impels us to perform it as well, and hence arises imitation. Although the difficulty is to establish the correctness of this assumption,[536] yet we may be pretty sure that the concept of a possible movement, if not crippled by antagonistic motives, does induce a certain readiness for fulfilment.[537] This analysis, it is true, acquaints us with a necessary condition of imitation, but as little accounts for the amazing force of the impulse as the mere conception of movement accounts for voluntary activity. While every concept may impel to the corresponding motor act, we know from experience that such tendencies to form habits are checked and aborted by all sorts of hindrances, mere inertia being sufficient in many cases to counteract the motive power of such concepts. There must be special reasons, then, which lend to the perception of a movement performed by another such extraordinary motive power. We have still to meet the question whether there may not be an inherited relation developed on the foundation and presupposition of the “readiness” described above. The thousand sensory motor paths involved in it can not be determined by heredity, since they presuppose acquired experience (as in learning to speak, first crude experimentation, then imitation). But the strength of the pleasurable quality in the reproduction of a movement accomplished first by another, the strenuousness of the effort which presses for expression, as well as the seriousness of the disappointment in cases of failure, are direct results of selection and the developmental factors connected with it. In support of this proposition we may refer to the social instincts, the simplest of which is the associativeness of members of the same race, tribe, or faction. Its demands lead to a kind of imitation, at least in movement impulses (Hudson assures us that the young pampas sheep runs the instant it is born after its rapidly running mother), and the impulse to answer a warning or alluring call. Pleasure in satisfying this genuine instinct is especially evident where one of the