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 both by guiding men's habits of thought, and so controlling the growth of institutions, and by selectively conserving certain traits of human nature that conduce to facility of life under the leisure-class scheme, and so controlling the effective temper of the community. The proximate tendency of the institution of a leisure class in shaping human character runs in the direction of spiritual survival and reversion. Its effect upon the temper of a community is of the nature of an arrested spiritual development. In the later culture especially, the institution has, on the whole, a conservative trend. This proposition is familiar enough in substance, but it may to many have the appearance of novelty in its present application. Therefore a summary review of its logical grounds may not be uncalled for, even at the risk of some tedious repetition and formulation of commonplaces.

Social evolution is a process of selective adaptation of temperament and habits of thought under the stress of the circumstances of associated life. The adaptation of habits of thought is the growth of institutions. But along with the growth of institutions has gone a change of a more substantial character. Not only have the habits of men changed with the changing exigencies of the situation, but these changing exigencies have also brought about a correlative change in human nature. The human material of society itself varies with the changing conditions of life. This variation of human nature is held by the later ethnologists to be a process of selection between several relatively stable and persistent ethnic types or ethnic elements. Men tend to