For the accommodation of the doubtful class, buildings might be erected constructed almost entirely of brick and stone and iron; wood should be avoided wherever possible, as it harbours filth, and is easily damaged or removed to light the fire with. The rooms should be square, and without corner or crevice, and should have floors made of material which could be cleansed thoroughly with a mop and a bucket of water. No human power could ever cleanse the wooden floors of the present dens. The water-supply in such houses would of course be an efficient one. At present the bad water-supply is a source of the greatest evils. One butt in a backyard frequently has to supply the inmates of half a dozen houses, and this butt is, in nine cases out of ten, open at the top, so that it easily becomes impregnated with objectionable matter. In one instance a butt, when cleared out, was found to contain the dead body of a cat, and a playful youth of the neighbourhood confessed to having tossed it in six weeks previously. This is the water the inhabitants not only do such washing with as they occasionally indulge in, but it is also the liquid with which they make their tea. In its simple condition, water, I may state, is not largely consumed by the adult population, but the children frequently quench their thirst with it. Here at least is one evil which may be dealt with to the advantage of the very poorest denizen of the slums. Another glaring iniquity in the present system is the insufficient accommodation of a most necessary kind, and this is an evil to which the most horrible phase of the 'domestic interior' of the slums is largely due. The only retiring-room in one place available for the 150 people who inhabit ten small houses is situated right away down another court, and in some instances the only accommodation of this kind is in the cellar of the building, and this cellar is inhabited by a family. Such a monstrous state of things as this will, of course, never be permitted in any new property, however low class it may be; and any improvement in such matters as this--the water supply, and the adaptability of the rooms to the cleaning process--will tell advantageously on the health and cleanliness and decency of the inhabitants. But while these improvements are being made, the old houses which are past repair must go, and many more are to be sacrificed to railway schemes and to new streets.