The following instructions, published in the Hospital Gazette, were prepared by a board of eminent physicians and surgeons for public information, and on the general proposition of disinfection they can hardly be surpassed: Three different preparations are recommended for use to make the purifying of a house, where infection has been, complete. The first is ordinary roll sulphur or brimstone, for fumigation; the second is a copperas solution, made by dissolving sulphate of iron (copperas) in water in the proportion of one and one-half pints to one gallon, for soil, sewers, etc.; the third is a zinc solution, made by dissolving sulphate of zinc and common salt together in water in the proportion of four ounces of the sulphate and two ounces of the salt to one gallon, for clothing, bed linen, etc. Carbolic acid is not included in the list, for the reason that it is very difficult to determine the quality of what is found in the stores, and the purchaser can never be certain of securing it of proper strength. It is expensive when of good quality, and it must be used in comparatively large quantities to be of any use. Besides it is liable, by its strong odor, to give a false sense of security. Nothing is commoner than to see saucers of carbolic acid and other disinfectants in a sick room. Considering the vitality of bacteria, and that they require carbolic solutions of more than five per cent or several hours of intense heat or similar heroic measures to kill them, it must be evident that such feeble vapors as can be tolerated in the sick room are utterly useless. Here are the instructions in full: =In the Sick Room=, the most valuable agents are fresh air and cleanliness. The clothing, towels, bed linens, etc., should, on removal from the patient and before they are taken from the room, be placed in a pail or tub of the zinc solution, boiling hot if possible. All discharges should either be received in vessels containing the copperas solution, or, when this is impracticable, should be immediately covered with the solution. All vessels used about the patient should be cleansed or rinsed with the same. Unnecessary furniture—especially that which is stuffed—carpets and hangings should, when possible, be removed from the room at the outset; otherwise they should remain for subsequent fumigation, as next explained.