The Seventh International Congress of Hygiene was held in London from August 10 to 15 of 1891. It is noteworthy for the number and representative character of its members, and also for the wide range of subjects affecting the physical welfare of the race, which were considered. Representatives from America and from Asia, as well as from the various nations of Europe, assembled in the Great Metropolis to consider the vital subject of Health. These learned men met together daily during the week in nine different sections, from ten to two o’clock. They were occupied with the subjects of Architecture, Engineering, Chemistry, the health of soldiers and sailors, the care of early childhood, the duty of the State in relation to the Health of the Nation, Health Statistics, Bacteriology, and the relations of Animal and Human Disease. In the consideration of this wide range of subjects, valuable experience and much useful information were presented in the papers read and in the discussions that followed. But in a Congress not held together by any great guiding principle, where persons of various nationalities, moulded by different laws, methods of education, and social customs were represented, a great variety of opinion, of contradictory facts, of imperfect statistics and superficial theories, would necessarily be brought forward. Nevertheless, a remarkable concensus of opinion established one great result of experience--a result which may be considered the striking practical lesson of the Congress--viz., that it is to sanitation that we must look, not only for the prevention of disease, but largely also for its cure. _Supremacy of Hygiene._--Taking the results of sectional discussions as a whole, it was very generally shown that, by our increasing knowledge of hygienic law, its wide diffusion amongst the people, and its intelligent application to daily life, we can counteract the evil influence of heredity, get rid of epidemics, improve the stamina of the race, advance in longevity and in the natural enjoyment of our earthly span of life. Thus it is by the advance of sanitation that the Art of Healing can alone become a science of Medicine. A few illustrations will show how this growing result of modern thought was both directly and indirectly supported by the papers and discussions of the various sections.