Page:The Theory of the Leisure Class.pdf/201

The forces which have shaped the development of human life and of social structure are no doubt ultimately reducible to terms of living tissue and material environment; but proximately, for the purpose in hand, these forces may best be stated in terms of an environment, partly human, partly non-human, and a human subject with a more or less definite physical and intellectual constitution. Taken in the aggregate or average, this human subject is more or less variable; chiefly, no doubt, under a rule of selective conservation of favourable variations. The selection of favourable variations is perhaps in great measure a selective conservation of ethnic types. In the life history of any community whose population is made up of a mixture of divers ethnic elements, one or another of several persistent and relatively stable types of body and of temperament rises into dominance at any given point. The situation, including the institutions in force at any given time, will favour the survival and dominance of one type of character in preference to another; and the type of man so selected to continue and to further elaborate the institutions handed down from the past will in some considerable measure shape these institutions in his own likeness. But apart from selection as between relatively stable types of character and habits of mind, there is no doubt simultaneously going on a process of selective adaptation of habits of thought within the general range of aptitudes which is characteristic of the dominant ethnic type or types. There may be a variation in the fundamental character of any population by selection between relatively stable types; but there is