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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