=Zinc Salts.=—The sulphate and the chloride of zinc are excellent disinfectants. They are colorless, and can therefore be used on clothing. They form, with albuminous matters, extremely insoluble compounds, and also absorb gases from putrefying material. They are the best disinfectants of their class. The sulphate is cheaper, but the chloride more efficient. Sulphate of zinc, 10 cents an ounce; chloride of zinc, 20 cents an ounce. It is better and cheaper to buy and mix one’s own disinfectants. The many proprietary articles are no more efficient, and are very expensive. The composition of some of those most in use is here given. (Analyses by Waller, of the New York City Health Department.) The first column gives parts in 100, and the second, ounces in a gallon in the case of liquids, and ounces in a pound in case of powders. Bromo-chloralum (Tilden & Co.), 50 cents a pint. Chloride of aluminum 8.152 12.71 Water, bromide of aluminum, lime salts, etc. 91.848 143.25 ———- ——— 100.000 155.96 Burnett’s Fluid is a solution of chloride of zinc (25 grains to the drachm). Carbolate of lime, in three-quarter pound boxes, at 25 cents. Lime 64.245 10.28 Magnesia 0.602 0.09 Sand, oxide of iron, etc. 0.670 0.11 Carbolic acid 0.472 0.07 Carbonic acid and organic impurities 34.021 5.45 ———- ——- 100.000 16.00 Chloralum (English Chloralum Co.), 50 cents a pint. Chloride of aluminum 13.213 20.14 Sulphate of lime 0.197 0.30 Water, chloride of calcium, etc. 86.590 131.99 ———- ——— 100.000 152.43 Chloride of lime, 20 cents a pound. Available chlorine 31.38 5.02 Lime salts, water, etc. 68.62 10.98 ——— ——- 100.00 16.00 Condy’s Fluid is a solution of permanganate of potash (9.26 grains to a fluid ounce, about 2-1/2 drachms to the pint). Darby’s Prophylactic Fluid, 50 cents a half-pint.