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3 away entirely with one of the uses of the chimney. If it be impossible to have a fireplace in the sleeping-room, then a ventilator of some sort should be introduced. There is, I believe, a system in use in some of the wards of St. George's Hospital and in the schools under the control of the London School Board, known as Tobin's Patent. Ventilation is here secured by means of a tube or pipe communicating directly with the outer air, which can thus be brought from that side of the building on which the atmosphere is freshest. If report can be trusted, this system certainly appears to come nearer to what is wanted than any with which we are yet acquainted, for it introduces fresh air without producing a draught, and the supply of air can be regulated by a lid at the mouth of the pipe. A sort of double-star is often introduced in a pane of glass in the window, but this is somewhat costly, and it would not be difficult to find other simpler and more primitive methods, from a tin shaft or loosened brick in a wall, down to half a dozen large holes bored by an auger in the panel of the door, six or eight inches away from the top, though this is only advisable if the door opens upon a tolerably airy landing or passage. If it does not, then resort to some contrivance, as cheap as you please, in the outer wall leading