Recent years have seen a remarkable improvement in the conditions of child life. In all civilized countries, but especially in England, statistics show a decrease in infant mortality. Related to this decrease in mortality a corresponding improvement is to be seen in the physical development of children; they are physically finer and more vigorous. It has been the diffusion, the popularization of science, which has brought about such notable advantages. Mothers have learned to welcome the dictates of modern hygiene and to put them into practice in bringing up their children. Many new social institutions have sprung up and have been perfected with the object of assisting children and protecting them during the period of physical growth. In this way what is practically a new race is coming into being, a race more highly developed, finer and more robust; a race which will be capable of offering resistance to insidious disease.