It would be pleasant if we could pick and choose those institutions which we like and impute them to human nature, and the rest to some devil; or those we like to our kind of human nature, and those we dislike to the nature of despised foreigners on the ground they are not really "native" at all. It would appear to be simpler if we could point to certain customs, saying that they are the unalloyed products of certain instincts, while those other social arrangements are to be attributed wholly to other impulses. But such methods are not feasible. The same original fears, angers, loves and hates are hopelessly entangled in the most opposite institutions. The thing we need to know is how a native stock has been modified by interaction with different environments. Yet it goes without saying that original, unlearned activity has its distinctive place and that an important one in conduct. Impulses are the pivots upon which the re-organization of activities turn, they are agencies of deviation, for giving new directions to old habits and changing their quality. Consequently whenever we are concerned with understanding social transition and flux or with projects for reform, personal and collective, our study must go to analysis of native tendencies. Interest in progress and reform is, indeed, the reason for the present great development of scientific interest in primitive human nature. If we inquire why men were so long blind to the existence of powerful and varied instincts in human beings, the answer seems to be found in the lack of a conception of orderly progress. It is fast becoming incredible that psychologists disputed as to whether they should choose between innate ideas and an empty, passive, wax-like mind. For it seems as if a glance at a child would have revealed that the truth lay in neither doctrine, so obvious is the surging of specific native activities. But this obtuseness to facts was evidence of lack of interest in what could be done with impulses, due, in turn, to lack of interest in modifying existing institutions. It is no accident that men became interested in the psychology of savages and babies when they became interested in doing away with old institutions. A combination of traditional individualism with the recent interest in progress explains why the discovery of the scope and force of instincts has led many psychologists to think of them as the fountain head of all conduct, as occupying a place before instead of after that of habits. The orthodox tradition in psychology is built upon isolation of individuals from their surroundings. The soul or mind or consciousness was thought of as self-contained and self-enclosed. Now in the career of an individual if it is regarded as complete in itself instincts clearly come before habits. Generalize this individualistic view, and we have an assumption that all customs, all significant episodes in the life of individuals can be carried directly back to the operation of instincts.