A proportion probably of some of the deeply seated, complicated, social problems which have presented themselves, unperceived and almost unconsciously, are the outcome of a one-sided study of hygiene: these, combined with the slow growth of social science, and a sickly, easy-going susceptibility, have been allowed to obscure the real issues of many well-intentioned but unwise and ill-considered philanthropic measures. The necessity, the _urgent_ necessity, has now, however, arisen for the bold and scientific solution of these social problems. The work of biologists, sociologists, and students of history during the last ten years has illuminated the whole question of race progress and public health with a light so powerful and clear that even he who runs can read the signs of the times by its clear rays; while to the millions of parents and guardians whose lives are spent in the care of children and home, its brilliance throws into high relief the dignified responsibility of their work, its far-reaching worth and enduring influence, as well as the fact that for its adequate performance something more is necessary than a bowing acquaintance with modern sanitary science. For what is the message of scientific hygiene to the parent and householder of the twentieth century? Dr. W. H. Burnham, of Clarke University, U.S.A., a world-wide authority on the subject, has formulated this message for us into three terse, but telling and suggestive, commands. The first gives solemn warning to beware of fads and of the many popular doctrines which are mediæval in their crudities and damaging by their unconsidered acceptance. The second preaches the gospel of _work_ and self-control, which must be practised in this as in every other connection where progress and good results are desired. The third enforces the doctrine of cleanliness to a degree as comprehensive as it is unusual--cleanliness in person, dwelling, and food; in air, water, and decoration; in occupation, environment and morals; the work of home hygiene being to secure for each family conditions which will permit normal and unhampered functioning for all the organs of each one of its members; elasticity and pliancy in the functions being a primary characteristic of health.