The constitution man has inherited from his anthropoid ancestors is far from fitting his present environment. The greatest disharmony of all is the morbid nature and brevity of the period of old age. Man does not round out his prescribed cycle and develop in its final stage an instinct for and love of death, as he should. He is expelled from the school of life at all stages of its curriculum but always before the final or senior year, until the fact that there was such a final grade has been almost forgotten. It was because man felt himself prematurely cut off that he developed all dreams of resurrection and of another life. Had he completed his life here he would never have wanted or dreamed of another. Had the involution that begins usually in the fifth decade or earlier gone on normally, it would have made each stage of the recessional no whit less delightful than those of the processional of youth till, having withdrawn more and more from life and being in the end quite satiated with it, the individual would have rejoiced to see the limitations that separate him from ultimate reality fall away until he merges, body and soul, into the cosmos from which he came. Only the simplest organisms are immortal and as we ascend the scale and develop a more complex soma, the more impossible does any kind of immortality become. Metchnikoff seeks nothing of this sort but would simply increase the number of years and enrich them in the last phase of our existence so that, instead of being the pitiful remnant it now is and instead of having to console itself so pathetically by the puerile and unsubstantial figments that religions and philosophies have given us, man would enter upon the full heritage that nature intended for him. Thus the highest goal of all endeavor is to overcome the present degeneration of senescence, to cultivate physiological old age; and when this ideal is realized, more and more of the complex and intricate affairs of social, industrial, political, and other forms of life will be left to the old men, for these things require not only technical training but, perhaps even more, the wide view, insight, and common sense for which experience with life is the best school.