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 to recall to us some trace of what we noticed in its grosser forms, an effect of automatism and of inelasticity. Now we can obtain a first glimpse—a distant one, it is true, and still hazy and confused—of the laughable side of human nature and of the ordinary function of laughter.

What life and society require of each of us is a constantly alert attention that discerns the outlines of the present situation, together with a certain elasticity of mind and body to enable us to adapt ourselves in consequence. Tension and elasticity are two forces, mutually complementary, which life brings into play. If these two forces are lacking in the body to any considerable extent, we have sickness and infirmity and accidents of every kind. If they are lacking in the mind, we find every degree of mental deficiency, every variety of insanity. Finally, if they are lacking in the character, we have cases of the gravest inadaptability to social life, which are the sources of misery and at times the causes of crime. Once these elements of inferiority that affect the serious side of existence are removed—and they tend to eliminate themselves in what has been called