advance and on sight what their respective characteristics are. The same is true of all human beings. They differ in certain fundamentals but always and invariably in accordance with their differences in size, shape and structure. The Instinct of Self-Preservation The reason for this is plain. Goaded by the instinct of self-preservation, man, like all other living things, has made heroic efforts to meet the demands of his environment. He has been more successful than any other creature and is, as a result, the most complex organism on the earth. But his most baffling complexities resolve themselves into comparatively simple terms once it is recognized that each internal change brought about by his environment brought with it the corresponding external mechanism without which he could not have
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