Silicate of alumina (clay) 56.876 9.10 Sesquichloride of iron 1.192 0.19 Sesquioxide of iron 7.102 1.14 Lime 2.470 0.39 Carbolic acid 0.400 0.06 Carbonic acid and organic impurities 31.960 5.12 ———- ——— 100.000 16.00 Phenol Sodique, 50 cents a half pint. Carbolic acid 1.177 1.61 Soda salts, water, and impurities 98.823 134.29 ———- ——— 100.000 135.90 Platt’s Chlorides, 50 cents a quart. Solution chloride of zinc (saturated) 40 parts. ” ” ” lead ” 20 ” ” ” ” calcium ” 15 ” ” ” ” aluminum ” 15 ” ” ” ” magnesium ” 5 ” ” ” ” potassium ” 5 ” —- 100 ” APPENDIX B. List of the prices of plumber’s materials and labor, from which a rough estimate may be formed of the probable cost of proposed plumbing. The prices given are wholesale ones, and it must be remembered that every plumber is also a retail merchant, who obtains his materials at a discount, and charges them to his customer at an average advance of 10 or 15 per cent on the prices here given. All measurements are of inside diameters. =Bands.=—Ordinary thickness, 2 by 2 inches, 75 cents; 6 by 6 inches, $1.90. Intermediate sizes at corresponding prices. =Bends= and =Offsets=.—Two inches in diameter, 40 cents; extra heavy, 50 cents. Six inches in diameter, $1.20; extra heavy, $1.75. =Cisterns= and =Service-boxes= (for water-closets), $10 to $20; (waste-preventing), $13 to $26. =Offsets.= See =Bends=. =Pipe.=—Tile or earthenware (vitrified), in lengths of 2-1/2 feet each, 2-inch, 13 cents a foot; 3-inch, 16 cents a foot; 4-inch, 20 cents a foot; and 5 cents more per foot for each additional inch of diameter. Iron, in lengths of 5 feet each: Ordinary, about 10 cents a foot for every inch of diameter. Extra heavy, about twice as much. Double-hub pipe, about 6 cents a foot more. The tar-coating costs about 3 cents a foot for 2-inch pipe, 4 cents for 3-inch pipe, etc.