4792. Solution of Carbonate of Ammonia

4792.    Solution of Carbonate of Ammonia. This is prepared by dissolving 1 part sublimed carbonate of ammonia in 3 parts water, and adding 1 part ammonia-water. Used in chemical analyses, and as a very delicate test for the presence of lime, from a solution of which it forms a white precipitate soluble in nitric or hydrochloric acid.

4793. Solution of Sulphuretted Hydrogen

4793.    Solution of Sulphuretted Hydrogen. Pass sulphuretted hydrogen gas through cold distilled water, recently boiled, until it will absorb no more. Keep in small bottles securely stoppered.

4794. Solution of Santonin

4794.    Solution of Santonin. The insolubility of santonin in water impairs its utility as a vermifuge. "Water, cold or warm, takes up the merest trace. Chloroform, absolute alcohol, the strongest acetic acid, turpentine, hot olive oil, and hot glycerine, are the only simple fluids that dissolve any appreciable quantity. But it separates from the oil and glycerine on cooling; and water added to the other solutions produces the same result. By the use of the following formula, however, a useful and effective solution may be obtained. Put 20 grains bicarbonate of soda and 3 ounces distilled water into a flask; keep the liquid near the boiling point and add 12 grains santonin, finely powdered, about 2 grains at a time, until the whole has dissolved. Solution is effected in about half an hour, during which time the water is reduced to 2 ounces, or, if not, may bo reduced to that bulk, when 1 ounce will contain a full dose - 6 grains of santonin. The solution is bright and permanent,, strongly alkaline, free from odor and taste, except that of carbonate of soda. Carefully neutralized with acetic acid, an equally bright and permanent solution is formed. Both may bo diluted to any extent, with hot or cold water without impairing the solution of santonin. Tho whole, or nearly tho whole, of the santonin is precipitated in its original form of colorless rectangular plates, with bevelled edges, immediately by mineral acids, and after some hours by excess of acetic acid.

4795. Miscible Copaiba

4795.    Miscible Copaiba. Mix transparent balsam of copaiba with half its volume of strong liquid of potassa of double strength. Different samples often require slightly different quantities of tho solution of potassa; it is therefore best to mix them gradually and cautiously together. Should tho mixture bo opaque, a little more of one or other of tho ingredients, as the case may be, will render it clear. No heat should be used. This article is miscible with water, with which it forms a kind of milk; and, from containing all the volatile oil of the copaiba, is a very valuable preparation. Its activity is conSOLUTIONS.

sidered equal to the balsam itself, and is given in similar doses.

4796.    Solution of Permanganate of