After ignoring impulses for a long time in behalf of sensations, modern psychology now tends to start out with an inventory and description of instinctive activities. This is an undoubted improvement. But when it tries to explain complicated events in personal and social life by direct reference to these native powers, the explanation becomes hazy and forced. It is like saying the flea and the elephant, the lichen and the redwood, the timid hare and the ravening wolf, the plant with the most inconspicuous blossom and the plant with the most glaring color are alike products of natural selection. There may be a sense in which the statement is true; but till we know the specific environing conditions under which selection took place we really know nothing. And so we need to know about the social conditions which have educated original activities into definite and significant dispositions before we can discuss the psychological element in society. This is the true meaning of social psychology. At some place on the globe, at some time, every kind of practice seems to have been tolerated or even praised. How is the tremendous diversity of institutions (including moral codes) to be accounted for? The native stock of instincts is practically the same everywhere. Exaggerate as much as we like the native differences of Patagonians and Greeks, Sioux Indians and Hindoos, Bushmen and Chinese, their original differences will bear no comparison to the amount of difference found in custom and culture. Since such a diversity cannot be attributed to an original identity, the development of native impulse must be stated in terms of acquired habits, not the growth of customs in terms of instincts. The wholesale human sacrifices of Peru and the tenderness of St. Francis, the cruelties of pirates and the philanthropies of Howard, the practice of Suttee and the cult of the Virgin, the war and peace dances of the Comanches and the parliamentary institutions of the British, the communism of the Southsea islander and the proprietary thrift of the Yankee, the magic of the medicine man and the experiments of the chemist in his laboratory, the non-resistance of Chinese and the aggressive militarism of an imperial Prussia, monarchy by divine right and government by the people; the countless diversity of habits suggested by such a random list springs from practically the same capital-stock of native instincts.