The wash-basin in the bath-room is either marble, enameled iron, or porcelain. The marble basins with a slab can be had for about $7.50, while the enameled iron basins cost from $6 to $40. To this must be added the cost of faucets and piping, together with the drain and the trap that belongs with the drain. The enameled iron basins which are being used to-day more than ever before have proved very satisfactory, have but little weight, can be fastened to the wall without difficulty, and take up less room than the old marble basin. A fancy porcelain basin costs about $75, and is no better for practical use than either of the others. Much the same kind of material may be used for bath-tubs, although warning ought to be given to avoid the use of the old-fashioned tin-lined bath-tub. This lining will easily rust or corrode, is very difficult to keep clean, and while the first cost is less than the enameled iron tub, it has no other advantage. An enameled iron tub five and a half feet long will cost from $20 to $100 without fixtures. _Cost of plumbing installation._ A fair estimate of the cost of the plumbing in a house, including all the fixtures mentioned except the tank in the attic, including also the plumber's bill, is $150. This requires very careful buying, and implies an entire absence of brass or nickel-plated piping. If a high grade of fixtures, including nickel fittings and nickel piping, wherever it shows, is used, the cost of the fixtures alone, not including labor or piping other than mentioned, will be from $150 up. _House drainage._ The term "plumbing" is generally used to include both the water-supply in the house, with all the fixtures pertaining thereto, and the carrying of the waste water to a point outside the house; it remains, therefore, to discuss the waste pipes connected with the plumbing fixtures. [Illustration: FIG. 60.--Leveling the drain.]