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If the reader who is unfamiliar with scientific things will obtain and read Metchnikoff's "Nature of Man," he will find there an interesting summary of the biological facts that bear upon and destroy the delusion that there is such a thing as individual perfection, that there is even ideal perfection for humanity. With an abundance of convincing instances Professor Metchnikoff demonstrates that life is a system of "disharmonies," capable of no perfect way, that there is no "perfect" dieting, no "perfect" sexual life, no "perfect" happiness, no "perfect" conduct. He releases one from the arbitrary but all too easy assumption that there is even an ideal "perfection" in organic life. He sweeps out of the mind with all the confidence and conviction of a physiological specialist, any idea that there is a perfect man or a conceivable perfect man. It is in the nature of every man to fall short at every point from perfection.
From the biological point of view we are as individuals a series of involuntary "tries" on the part of an imperfect species towards an unknown end.