Lead, about 9 cents a pound. Manufactured pipe (traps, etc.), 10 cents a pound. Qualities are marked according to thickness—i. e., weight for each size, AAA (best), AA, A, B, C, D, and E. 3/8-inch pipe, AAA weighs 1 pound 12 ounces per foot; B weighs 1 pound per foot; C weighs 14 ounces per foot; D weighs 7 ounces per foot. 5/8-inch pipe, AAA weighs 3 pounds 8 ounces per foot; AA weighs 2 pounds 12 ounces per foot; B weighs 2 pounds per foot. 3/4-inch pipe, AAA weighs 4 pounds 14 ounces per foot; B weighs 2 pounds 3 ounces per foot. 1-inch pipe, AAA weighs 6 pounds per foot; AA weighs 4 pounds 8 ounces per foot; A weighs 4 pounds per foot; B weighs 3 pounds 4 ounces per foot; D weighs 2 pounds 4 ounces per foot. 2-inch pipe, AAA weighs 10 pounds 11 ounces per foot; AA weighs 8 pounds 14 ounces per foot; A weighs 7 pounds per foot; B weighs 6 pounds per foot; D weighs 4 pounds per foot. 3-inch pipe, 3/8 thick, weighs 19 pounds 9 ounces per foot. 4-inch pipe, 3/8 thick, weighs 25 pounds 6 ounces per foot, and so on. For supply-pipes, AA pipe is generally used. =Privy-Sinks.=—About $5 for every foot in length. =Saddle-Hubs.=—2 by 2 inches, 30 cents; extra heavy, 40 cents. 6 by 6 inches, $1.10; extra heavy, $1.40. =School-Sinks.= See =Privy-Sinks=. =Traps.=—Adee traps about 5 cents apiece less than ordinary S-traps, and Bower traps about twice as much. Earthenware, 2-inch, $1 each; 6-inch, $3.25 each. Iron (S-traps), 2-inch, 80 cents; extra heavy, $1.25; 6-inch, $3.75; extra heavy, $5. Running traps, with or without hand-holes, about the same. Lead, made of 6-pound lead (lead weighing 6 pounds to the square foot), 1-1/4-inch, 65 cents; 1-1/2-inch, 80 cents; 2-inch, $1.10; 4-1/2-inch, $3.25, etc. =Urinals.=—(Earthenware), $5 to $6 each. =Wash-Basins.=—(Iron, enameled or marbled), $1.50 to $4.50. =Water-Closets.=—Demarest’s (plunger), $15 to $40. Earthenware hopper, $10 to $12. Earthenware hopper, with trap, waste-preventing cistern, chain and bracket, wood-seat, etc., $30. Hopper-valve closet, with self-raising, round seat, $9. =Pan-Closets.=—$4.50 to $22. A journeyman and helper are charged for at the rate of from $5 to $6 per day. INDEX. Acid, carbolic, 72, 91. carbonic, 7-9, 13, 15. carbonic, test for, 9. hydrochloric, 93. nitric, 88. nitrous, 95. sulphuric, 89, 93, 95. sulphurous, 70, 96. Adulterations of food, 73. Air, contaminated by combustion, 9. contaminated by excreta, 12, 21. contaminated by respiration, 8, 11. contaminated by the sick, 11. dangers of impure, 11-14. Air-bound pipes, 57. Air in ground, 15. Alum, 75. Aluminum, chloride of, 93. Annotto, 77, 78. Areas, drainage of, 34. Arrowroot, 74. Asphalt in walls, 34, 66. Bacilli, 11, 14. Bacteria, 11. Bad odors, sources of, 52. Bakers’ chemicals, 74. Baking-powders, 75. Ball-cock, 48. Bands, 60, 100.