Those who argue that social and moral reform is impossible on the ground that the Old Adam of human nature remains forever the same, attribute however to native activities the permanence and inertia that in truth belong only to acquired customs. To Aristotle slavery was rooted in aboriginal human nature. Native distinctions of quality exist such that some persons are by nature gifted with power to plan, command and supervise, and others possess merely capacity to obey and execute. Hence slavery is natural and inevitable. There is error in supposing that because domestic and chattel slavery has been legally abolished, therefore slavery as conceived by Aristotle has disappeared. But matters have at least progressed to a point where it is clear that slavery is a social state not a psychological necessity. Nevertheless the worldlywise Aristotles of today assert that the institutions of war and the present wage-system are so grounded in immutable human nature that effort to change them is foolish. Like Greek slavery or feudal serfdom, war and the existing economic regime are social patterns woven out of the stuff of instinctive activities. Native human nature supplies the raw materials, but custom furnishes the machinery and the designs. War would not be possible without anger, pugnacity, rivalry, self-display, and such like native tendencies. Activity inheres in them and will persist under every condition of life. To imagine they can be eradicated is like supposing that society can go on without eating and without union of the sexes. But to fancy that they must eventuate in war is as if a savage were to believe that because he uses fibers having fixed natural properties in order to weave baskets, therefore his immemorial tribal patterns are also natural necessities and immutable forms. From a humane standpoint our study of history is still all too primitive. It is possible to study a multitude of histories, and yet permit history, the record of the transitions and transformations of human activities, to escape us. Taking history in separate doses of this country and that, we take it as a succession of isolated finalities, each one in due season giving way to another, as supernumeraries succeed one another in a march across the stage. We thus miss the fact of history and also its lesson; the diversity of institutional forms and customs which the same human nature may produce and employ. An infantile logic, now happily expelled from physical science, taught that opium put men to sleep because of its dormitive potency. We follow the same logic in social matters when we believe that war exists because of bellicose instincts; or that a particular economic regime is necessary because of acquisitive and competitive impulses which must find expression.