The Bulletin of the health department of Chicago, for April, gives some interesting statistics and diagrams showing the increased duration of life during the past quarter-century. According to it, the average age at death of 10,203 persons whose deaths are recorded for 1872, was fifteen years, two months and ten days. In 1882, the average age at death in 13,606 recorded was nineteen years, seven months and one day. In 1892 it was twenty-two years and eight months, and in 1898 the average age of 22,897 decedents was twenty-nine years, four months and sixteen days. These figures, remarkable as they are at first sight, are explainable by two facts: one, the increase of elderly and aged persons in the population, a factor to be considered in the statistics of every new and growing community, and the other, much more significant from a sanitary point of view, the reduction of infantile