Underlying the anthropological study of man is the principle that there is a reality to which man must adapt if he is to survive. Reproduce, and to perpetuate himself. Populations must adapt to the realities of the physical world and maintain a proper "fit" between their biological makeup and the pressures of the various niches of the world in which they seek to live. Social groups where culture is found must develop adaptive mechanisms in the organization of their social relations if there is to be order, regularity, and predictability in patterns of cooperation and competition and if...