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 and in miniature, some of the earlier phases of the development of adult man. Under this interpretation, the boy's predilection for exploit and for isolation of his own interest is to be taken as a transient reversion to the human nature that is normal to the early barbarian culture—the predatory culture proper. In this respect, as in much else, the leisure-class and the delinquent-class character shows a persistence into adult life of traits that are normal to childhood and youth, and that are likewise normal or habitual to the earlier stages of culture. Unless the difference is traceable entirely to a fundamental difference between persistent ethnic types, the traits that distinguish the swaggering delinquent and the punctilious gentleman of leisure from the common crowd are, in some measure, marks of an arrested spiritual development. They mark an immature phase, as compared with the stage of development attained by the average of the adults in the modern industrial community. And it will appear presently that the puerile spiritual make-up of these representatives of the upper and the lowest social strata shows itself also in the presence of other archaic traits than this proclivity to ferocious exploit and isolation.

As if to leave no doubt about the essential immaturity of the fighting temperament, we have, bridging the interval between legitimate boyhood and adult manhood, the aimless and playful, but more or less systematic and elaborate, disturbances of the peace in vogue among schoolboys of a slightly higher age. In the common run of cases, these disturbances are confined to the period of adolescence. They recur with decreasing