Just what this handicap amounts to, so far as it works out in physical consequences, is to be gauged by certain almost classical figures, which I have here ventured to present again in graphic form. These figures do not present our total failure, they merely show how far the less fortunate section of the community falls short of the more fortunate. They are taken from Clifford Allbutt’s _System of Medicine_ (art. “Hygiene of Youth,” Dr. Clement Dukes). 15,564 boys and young men were measured and weighed to get these figures. The black columns indicate the weight (+9 lbs. of clothes) and height respectively of youths of the town artisan population, for the various ages from ten to twenty-five indicated at the heads of the columns. The white additions to these columns indicate the additional weight and height of the more favoured classes at the same ages. Public school-boys, naval and military cadets, medical and university students, were taken to represent the more favoured classes. It will be noted that while the growth in height of the lower class boy falls short from the very earliest years, the strain of the adolescent period tells upon his weight, and no doubt upon his general stamina, most conspicuously. These figures, it must be borne in mind, deal with the living members of each class at the ages given. The mortality, however, in the black or lower class is probably far higher than in the upper class year by year, and if this could be allowed for it would greatly increase the apparent failure of the lower class. And these matters of height and weight are only coarse material deficiencies. They serve to suggest, but they do not serve to gauge, the far graver and sadder loss, the invisible and immeasurable loss through mental and moral qualities undeveloped, through activities warped and crippled and vitality and courage lowered.