_The Health of Proletarian Children._--Owing to the lesser resisting power of children, the factors of ill-health operate much more powerfully in the case of youthful than in the case of adult proletarians. But other factors are in operation in addition to this inferior power of resistance. Unfavourable conditions act upon proletarian women during pregnancy, and affect proletarian children at the time of birth. The circumstance which more than all others is injurious to the health of these children, and which contributes to produce the result that a larger percentage of working-class than of upper-class children are feeble-minded, is quantitative and qualitative insufficiency of nutriment. Studies of the relationship between the prices of food-stuffs and the average working-class income have shown that the majority of working men have an income too small to provide for themselves and their children the minimum quantity of nutritive materials (of the proper quality) which physiological science has proved to be indispensable to the daily renewal of the bodily forces. Statistical data prove beyond question that the height and the body-weight of proletarian children are less than those of children of the well-to-do. Rickets is principally a disease of children of the poorer classes. Among upper-class children the severer forms of this disease is hardly ever seen. Rickets arises chiefly as a sequel of digestive disturbances; and these, in their turn, are referable to the deficiencies of artificial feeding. Among the poor we find many more blind children and many more deaf mutes than among the rich, the reason being that among the poor, in so many instances, when the defect is first noticed, no attempt is made to seek medical advice. According to trustworthy statistical data, 95 per cent. of the occupants of blind asylums belong to the poorer classes.