Thus, because every external characteristic is the result of natural laws, and chiefly of natural selection, the vital traits of any creature can be read from his externals. Every student of biology, anatomy, anthropology, ethnology or psychology is familiar with these facts. Built to Fit Man's organism has developed, altered, improved and evolved "down through the slow revolving years" with one instinctive aim--successful reaction to its environment. Every part has been laboriously constructed to that sole end. Because of this its functions are marked as clearly upon it as those of a grain elevator, a steamship or a piano. Survival of the Fittest
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