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291 this latter section are indicated the kind of marriages most likely either to produce healthy children or to neutralize the unfavourable tendencies of the parents. We are afterwards told of the influence of air, water, and soil, on the peculiarities of races. Dr. Clavel then divides his views respecting physical education, into three periods :-First, childhood up to the seventh year; boyhood, from seven to fourteen; and youth, from fourteen to twenty-one. We have been particularly pleaseddoi:10.1016/s0140-6736(02)51718-9 fatcat:3twx4j5rmngnlgfmtf3thqsak4