Marriage, according to Dr. Schwartz. oí Berlín, is the most important factor in longevity. Of every 200 persons ■who reach the age of 40 years 125 are married and 75 unmarried. At sixty years the proportions are 48 to 22; at 70 years, 27 to 11, and at 90 years, 9 to 3. Fifty centenarians had all been married. The doctor asserts that the rate of mortality for husbands and ■wives between the ages of 30 and 45 years is 18 per cent, while that for unmarried persons is 28 per cent.