J. Madison Taylor[160] notes the paucity of literature on this subject that he found in trying to read up on it and thinks it warrants far more attention. The foundations for longevity are laid in the first few months of life and bottle-fed babies are shorter-lived and much less likely to reach old age. Those who spend their infancy and childhood, too, in large centers are less long-lived than those brought up in the country. A serene mental view and capacity for deliberate enjoyment of whatever betides he places first of all and advises self-education in serenity. The less we eat and the less variety, the longer we live, and on this the author lays great stress. We must put aside, as we advance, some articles of diet of which we are fond. He believes dentists have greatly interfered with longevity because man was meant to be more or less toothless and thus to be reduced in old age to childish diet and fluids, while the dentists enable us to eat anything we ever did, which is against Nature. He speaks of fads and their dangers, for example, one old lady thought she prolonged her life by eating a great deal of salt. The indolence and indifference of age is a great difficulty. If one persists in trying to keep up indefinitely, the results are often amazing. Medical aid should be sought more constantly for lesser ills. Man is like an old horse--if he once gets thoroughly out of condition it is hard to bring him back. G. M. Gould has believed that unfit glasses have shortened the lives of many eminent men. But open air is a _sine qua non_ always. Tessier gives a clinical picture of approaching death--(1) heart and blood vessels, (2) lungs, (3) kidneys, (4) digestive organs, (5) the brain. Most agree that the heart plays the chief rôle in ending life and many used to think that nearly all old-age diseases were from arterial hardening. But this was doubtless much exaggerated. Old age is a progressive diminution of all functional activities. All clinicians recognize diatheses or a tendency toward disease and we can detect them in their incipiency now far more than formerly. Age diathesis means a lessened coefficient of resistance, quick exhaustion, and weak repair. The author devotes great attention to obesity, which shortens life, and he advocates various exercises of the extensor muscles, deep breathing, and thinks much can be done to tone up and increase the activity of the heart. He thinks the effects of the menopause have been rather overestimated. Exhaustion, especially induced by emotions, fatigue, anger, grief, and fear, weaken the protective powers of the mysterious agents of immunity. The mind is very liable to become fixed upon some ailment and hyper-conscious, particularly near the menopause, and this is due to failure of the organism to offer the same degree of resistance to toxins and to a general lessening of functional activity.