with respect to its application for making saline draughts, see _Acid: Citricum:_ DOSE, grs v to ℈j: to produce emesis ʒss. See _Form. 48, 49, 83, 152_. _Officinal Preparations._ _Liquor Ammoniæ sub-carbonatis_, L. _Liquor Ammoniæ acetatis_ (=I=) L.E.D. _Liniment: Ammoniæ Sub-carbonatis._ L. _Cuprum Ammoniatum_, (=I=) L.E.D. ADULTERATIONS. This salt ought to be entirely volatilized by heat; if any thing remain it may be considered impure; it ought also to be free from all fetor; should this not be the case it may be corrected by subliming it in conjunction with powdered charcoal; there is at present a large quantity of this impure article in the market, which has been manufactured from the residue sold by the gas light companies.[367] When long exposed to the air, it becomes opaque and friable, and the excess of ammonia, upon which its odour depends, escapes, carbonic acid is absorbed, and an inodorous bi-carbonate remains, consisting of carbonic acid 55·70, Ammonia 21·52, and water 22·76, or 2 atoms of carbonic acid, 1 atom of ammonia, and 2 atoms of water. AMMONIÆ MURIAS. L.E. Sal Ammoniacum. D. vulgo _Sal Ammoniac_. QUALITIES. _Form_, dense striated concavo-convex cakes which are persistent in the air, or crystallized conical masses; in this latter form it generally contains other salts, especially muriate of lime, which render it deliquescent. _Taste_, bitter, acrid, and cool. CHEMICAL COMPOSITION. In consequence of the present unsettled opinions respecting the nature of muriatic acid and ammonia, and the changes which they undergo by combination with each other, the composition of this salt is involved in some obscurity. According to Dr. Thomson, it consists of equal volumes of muriatic acid gas and ammoniacal gas, although he has subsequently observed that from the peculiar properties of the substance, it may be a compound of _Chlorine_ and _Ammonium_ (the hypothetical base of ammonia.) Unlike all the other ammoniacal salts, it does not undergo decomposition by heat. SOLUBILITY, f℥j of water at 66° dissolves about two drachms and a half; at 212° it dissolves its own weight; it is also soluble in 4½ parts of alcohol; its solution in water is accompanied by considerable reduction of temperature. INCOMPATIBLE SUBSTANCES. The sulphuric and nitric acids unite with the ammonia, and disengage the muriatic acid, whilst ammonia is disengaged by the action of potass and its carbonate, carbonate of soda, lime, magnesia, &c. which combine with its muriatic acid; with oxy-muriate of mercury it combines and increases its solubility, see _Hydrarg: Oxy-murias_. When united with acetate of lead, it decomposes it, and a muriate of lead is precipitated. It is obvious also that nitrate of silver, and all the metallic salts whose bases form insoluble compounds with muriatic acid, are incompatible with it. USES. Rarely employed as an internal remedy, externally it is employed in lotions, either for the cold produced