I have spoken of the plunge bath as a feature capable of being rendered a thing of beauty. This is in reference as much to its plan as to the materials of the sides and floor, &c. There is no reason why a plunge should always be a plain oblong on plan. It may be of any of the shapes indicated at Fig. 19. Many bathers, especially in warm weather, like to stay some minutes in the plunge, and not go straight through; they may like to swim up and down the bath, and thus require room to turn, and a keyhole plan, such as at A, is suitable, and especially useful where the bather has to return to the end of bath he entered. Another shape is shown at B. In ladies' baths still more margin for novel planning is allowable, as here the true dive seldom pertains. A delicate semi-oval plan, such as that at D, which is much after the pattern of the Roman bath recently discovered at Box, could be employed; or a plain, circular bath with steps around, such as that of the Pompeian _Balneum_, shown at C; or, again, such a plan as that at E, after the classic one at Bognor in Sussex. For inspirations as to the plans of plunge baths, we cannot do better than refer direct to the old Roman remains, either in Italy itself, or in Great Britain and other provinces and colonial dependencies of the old Empire. The Romans were fully alive to the possibilities of the plunge bath as a subject for artistic design, and often produced baths of great beauty. [Illustration: FIG. 19. Plans of Plunge Baths.] The flooring and sides of these baths should be of a light tint, and there should always be more or less pure white. Nothing really is better than plain white glazed bricks, with neat joints. With this bottom the water always looks clean when it is clean, and shows contamination when it exists. Marble-mosaic floorings should be chiefly of white tesseræ, any simple patterns being executed in light tints. Delicate tints, such as strawberry, pea green, and peacock blue, look well through the water. The floor of the plunge bath may thus be made very pretty. The sides are best of glazed brickwork, neatly executed, and coping and treads of steps of so-called white marble. FURNISHING.