* * * * * If we are agreed that it is only in man that self-consciousness is to be found at all, it follows that only to man can we look for any facts bearing upon the question of its development. And inasmuch as it is only during the first years of infancy that a normal human being is destitute of self-consciousness, the statement just made implies that only in infant psychology need we seek for the facts of which we are in search. Further, as I maintain that self-consciousness arises out of an admixture of the protoplasm of judgment with the protoplasm of sign-making (according to the signification of these terms as already explained), I have now to make good this opinion upon the basis of facts drawn from the study of infant psychology. Nevertheless, before I proceed to the heart of the subject, I think it will be convenient to consider those faculties of mind which, occurring both in the infant and in the animal, in the former case precede the advent of self-consciousness, and, according to my view, prepare the way for it. It will, I suppose, on all hands be admitted that self-consciousness consists in paying the same kind of attention to internal or psychical processes as is habitually paid to external or physical processes—a bringing to bear upon subjective phenomena the same powers of perception as are brought to bear upon the objective. The degrees in which such attention may be yielded are, of course, as various in the one case as in the other; but this does not affect my psychological definition of self-consciousness.