The drainage system of a hot-air bath is a most important consideration. In a place where the occupants are, literally, _breathing at every pore_, it is obvious that too much care cannot be taken to prevent all possible odours, and the slightest suspicion of an escape of deleterious sewer gases. The traps employed in the washing rooms should be of the best possible design and material, and proof against the evil known as "siphoning." The gullies above them are best placed adjoining one of the ventilators in the walls, at the floor level, as then a current of air sweeps over them and up the extraction flues. It is not always that an opportunity is afforded to cut off the waste water from the drainage; where the bath rooms are above ground, however, this should be done if practicable. Where possible, an excellent plan is to construct a culvert under the basement floor. In this the whole of the pipes can be placed--the soil-pipes, the lavatorium and plunge bath wastes, &c., and access gained to them by a manhole. By this means a cut-off could be effected between waste-pipes and the sewerage system. The culvert itself could be ventilated by connecting it with an extraction flue. This is all costly; but the builder of a Turkish bath will do well to be prepared to lay out a liberal sum to perfect the system of drainage of the establishment, and in the end, when the public have appreciated the attention bestowed, he will thank his architect for having impressed upon him the necessity for this extra expenditure. THE DOUCHE ROOM. The douche room should be a small chamber adjoining the lavatorium, and fitted with a circular needle bath with shower or douche above, and any other kind of spray bath that may be required. It should not be a dark, cold, uninviting hole. For this reason, and also because a corner is admirably adapted to receive an appliance of the shape of a needle bath, it is better, often, to fit it up in an angle of the lavatorium. But of these additions I shall have much to say anon, as one of the most important points about a bath is the arrangement of the water-fittings. Needle baths will be found indicated, on the plans given in these pages, by an incompleted circle. THE PLUNGE BATH.