Professor Fisher, of the Committee of One Hundred appointed to consider the problem of the national health, was laboring with Senator Works of California, the official representative in Washington of the Christian Scientists. “Your approval, Senator,” he said, “of such measures as clean streets and playgrounds is really an indorsement of preventive medicine.” “But,” exclaimed Senator Works, “I did not know you meant those things as being preventive medicine. I thought preventive medicine meant serums.” “No,” said Professor Fisher, laughing; “it means mosquito-bars and bath-tubs.” It is not only serums and bacteriology, but mosquito-bars and bath-tubs, clean streets and plenty of sewers, together with an efficient organization to perfect the operation of such things, that have revolutionized the conditions of health in New York City. Consider what has been done for poor children alone. Recently I stood in one of the fifty-five diet-kitchens maintained by the city. A poor woman of the neighborhood entered, carrying in her arms a sickly baby. Evidently familiar with the proper course of procedure, she said to the nurse in charge, “I have given him castor-oil and barley gruel; now what shall I do?” This incident is remarkable because the woman never before had come within the reach of the Health Department. In the danger that menaced the child, she had learned to take the first essential steps not through experience or instruction, but merely through neighborhood gossip. CONDITION OF NEW YORK HALF A CENTURY AGO Ten years ago such a thing would have been impossible in New York or in any other large city. The tremendous agencies that now exist for the medical enlightenment of the masses were then unheard of. A generation ago New York was in a condition of almost primeval darkness concerning questions of public health. Canton or Constantinople is to-day little worse off than was America’s chief city then. In 1866 the public health conditions of New York were in so low a state that the average length of life of the inhabitants was thirty years. In 1912 these conditions had been improved so that the average length of life was sixty-six years. Thus the value of human life, reckoned in terms of time alone, had more than doubled in less than half a century.