=Meaning of Customs or Mores.=--Wherever we find groups of men living as outlined in Chapter II., we find that there are certain ways of acting which are common to the group--"folkways." Some of these may be due merely to the fact that the members are born of the same stock, just as all ducks swim. But a large part of human conduct, in savage as truly as in civilized life, is not merely instinctive. There are _approved_ ways of acting, common to a group, and handed down from generation to generation. Such approved ways of doing and acting are customs, or to use the Latin term, which Professor Sumner thinks brings out more clearly this factor of approval, they are _mores_.[23] They are habits--but they are more. They imply the judgment of the group that they are to be followed. The welfare of the group is regarded as in some sense imbedded in them. If any one acts contrary to them he is made to feel the group's disapproval. The young are carefully trained to observe them. At times of special importance, they are rehearsed with special solemnity. =Authority Behind the Mores.=--The old men, or the priests, or medicine men, or chiefs, or old women, may be the especial guardians of these customs. They may modify details, or add new customs, or invent explanations for old ones. But the authority back of them is the group in the full sense. Not the group composed merely of visible and living members, but the larger group which includes the dead, and the kindred totemic or ancestral gods. Nor is it the group considered as a collection of individual persons. It is rather in a vague way the whole mental and social world. The fact that most of the customs have no known date or origin makes them seem a part of the nature of things. Indeed there is more than a mere analogy between the primitive regard for custom and that respect for "Nature" which from the Stoics to Spencer has sought a moral standard in living "according to nature." And there is this much in favor of taking the world of custom as the standard: the beings of this system are like the person who is expected to behave like them; its rules are the ways in which his own kin have lived and prospered, and not primarily the laws of cosmic forces, plants, and animals. =Origin of Customs; Luck.=--The origin of customs is to be sought in several concurrent factors. There are in the first place the activities induced by the great primitive needs and instincts. Some ways of acting succeed; some fail. Man not only establishes habits of acting in the successful ways; he remembers his failures. He hands successful ways down with his approval; he condemns those that fail.