are thus compelled to infect the region of their own dwellings. Nor is this enough. All conceivable evils are heaped upon the heads of the poor. If the population of great cities is too dense in general, it is they in particular who are packed into the least space. As though the vitiated atmosphere of the streets were not enough, they are penned in dozens into single rooms, so that the air which they breathe at night is enough in itself to stifle them. They are given damp dwellings, cellar dens that are not waterproof from below, or garrets that leak from above. Their houses are so built that the clammy air cannot escape. They are supplied bad, tattered, or rotten clothing, adulterated and indigestible food. They are exposed to the most exciting changes of mental condition, the most violent vibrations between hope and fear; they are hunted like game, and not permitted to attain peace of mind and quiet enjoyment of life. They are deprived of all enjoyments except that of sexual indulgence and drunkenness, are worked every day to the point of complete exhaustion of their mental and physical energies, and are thus constantly spurred on to the maddest excess in the only two enjoyments at their command. And if they surmount all this, they fall victims to want of work in a crisis when all the little is taken from them that had hitherto been vouchsafed them. How is it possible, under such conditions, for the lower class to be healthy and long lived? What else can be expected than an excessive mortality, an unbroken series of epidemics, a progressive deterioration in the physique of the working population? Let us see how the facts stand.