This house has, if one may say so, been over-plumbered. There are five closets, five sinks, and a bath-waste (eleven trapped waste-pipes) for a maximum of twelve people. The closet on the second floor, and the one in the basement between the servants' hall and kitchen, should be abolished, and the fixed bath on the second floor should be removed. A bath-room wants light and air, and should always be against an outside wall. Persons should never take houses with extemporised bath-rooms poked in 'anywhere.' In order to be fairly wholesome this house wants a fan-light over, or a glazed panel in, the front door, to serve the purpose of a window and ventilator, and a window over W.C between the morning-room and study. In this way there will be the possibility of a through draught at the foot of the stairs. The staircase window on the second floor should be re-opened, and a window put above the W.C on the top floor (the W.C. need not be more than 7 feet 6 inches in height). In this way the main channel of internal communication will be ventilated, and should any of the sanitary fittings 'go wrong,' the emanations will be diluted, perhaps to safety point. Now we may assume that the house we have been considering, with three rooms on the ground floor, would let for about 350_l._ per annum, and would be rated at 300_l._ The alterations in the plumbing arrangements, as shown in fig. 2, are estimated by the 'Lancet' experts to cost 618_l._, or, let us say, a sum equal to twice the rateable value, and which adds (calculating 10 per cent, for wear and tear) at least 60_l._ per annum to the cost of the house. The local rates for this house would amount to over 90_l._ per annum, and if we assume that one-third of this is for sewerage, we may say that the sanitation of the house costs 90_l._ per annum, a sum sufficient to pay for the transmission by Parcel Post of 1,800 packets, weighing 11 lbs. each. Leaving the question of the waste of fertilising material out of consideration, it is clear that sanitation by water is as extravagant as it is dangerous. VENTILATION OF CORRIDORS In the suggestions which the Medical Committee has drawn up for the guidance of the architect in making plans for the extension and ultimate complete rebuilding of University College Hospital, the thorough ventilation of the staircases and corridors is insisted upon; and the building is to be so constructed that it will be impossible for air to drift from one floor to another, or from one ward to another, without first mixing with the outside air. Builders of mansions and hotels would do well to keep the same principles of construction in view. [Illustration: Fig. 4.]