There are, of course, many expedients for producing perspiration by heated air much simpler than by the special construction of a suite of bath rooms; but as they will be familiar to all studying the subject of baths, I will pass them over here as mere makeshifts. For although there is something to be said in their favour, in that the head is free and one can breathe cooler air, there are serious objections to their use, as the lamps employed _burn the air_, and there is also an absence of that rapid aërial circulation which is so much to be desired. Besides the actual objections to their use, more or less inconvenience attends the employment of the sheet and lamp (or cabinet and lamp) baths, and there is little of the luxury of a true sudatorium about the extemporised bath, admirable as it may be as a hydropathic expedient. The bath in the house may consist of one of the following arrangements:--(1) A single room used as a sudatory chamber and for washing; (2) a hot room and a washing room; (3) a combined hot room and washing room, and a cooling room; (4) a cooling room, washing room, and hot room; or (5) a suite of chambers of such extent as to provide every possible luxury, such as even the old Roman gentlemen would have coveted. Where there is no second room the bather must use his bed room as a cooling and reposing room, as he must also in the cases where only a washing room and a hot room are provided. [Illustration: FIG. 22. Plan of Mr. Urquhart's Small Private Bath and of the Hot Room at Sir Erasmus Wilson's Bath at Richmond Hill.] For a simple sudatory chamber, where washing operations are also conducted, all that is required is a room with brick walls and fire- and heat-proof floor and ceiling, with an adjoining lobby, a flue to conduct smoke from a simple stove, and a sunk washing tank or _lavatrina_. Allowance must be made for a couch opposite the stove. Fig. 22 (A) shows the simplest form of a bath room possible; it is that which Mr. Urquhart constructed, and has described in his 'Manual of the Turkish Bath.' It was erected by him to show how cheaply an effective bath room might be built, the whole arrangement, with water fittings and building of three of its walls, only costing 37_l._ The room or rooms forming the Turkish bath in a private house should be cut off by a lobby from the other apartments of the house, with carefully-fitting self-closing doors at either end; and in the case of an elaborate bath, another little lobby with double doors and heavy curtains, should be placed between the cooling room and the two bathing rooms, as at Fig. 24. The air of the hot rooms should, of course, be perfectly and absolutely cut off from that of the house.