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Catlin, North American Indians, i. p. 36; see also ii. p. 347. W. I. Thomas, Sex and Society, pp. 115-6. For a good summary, see Donaldson's Growth of the Brain, pp. 241-48. See on this subject the two fine works by Karl Groos, The Play of Animals, The Play of Man. W. Temple, Repton School Sermons. Sanity and Insanity, p. 281. Adolescence, ii. pp. 286-7. Southey's Life of Wesley, chap. xxiv.
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