Calcii Chloridum. Lond. Chloride of Calcium

"Take of chalk, five ounces; hydrochloric acid, distilled water, each half a pint. Mix the acid with the water, and add gradually the chalk to saturation. Then the effervescence being finished, filter : evaporate the fluid until the salt is dried. Put it into a crucible, and having liquefied it in the fire, pour it upon a clean flat stone. Finally, when it is cold, break it into small pieces, and keep it in a well-stopped bottle."

Calcis Murias, Dub. Muriate of Lime.

"Take of the liquor which remains after the distillation of the solution of caustic ammonia, any quantity; strain the solution, and keep it over the fire in a shallow vessel until the muriate of lime is completely dry. It must be kept in a well-stopped bottle."

This preparation is a chloride of calcium, and consists of chlorine of 64.29 + calcium 35.71, in 100 parts; or 1 eq. of calcium =20.5 + 1 of chlorine =35.42, making the equivalent of the salt 55.92.l

Qualities. - Chloride of calcium is an inodorous, white, fusible, deliquescent, bitter, pungent salt. It is very soluble in both hot and cold water. It is very soluble also in alcohol. During its solution much cold is produced; and, if snow be used, a freezing mixture, capable of lowering the thermometer from 32° to - 50°, is obtained.

Medical properties and uses. - It is sometimes, but rarely, administered in scrofulous affections.

Officinal preparation.-Liquor Calcii Chloridi, L. E.D.

Liquor Calcii Chloridi. Lond. Solution of Chloride of Calcium

"Take of chloride of calcium, four ounces; distilled water, twelve fluid ounces. Dissolve the chloride of calcium, and filter."

Solutio Muriatis Calcis, Edin. Solution of Muriate of Lime.

1 Translation of the Pharmacopaeiay p. 74.

"Take of the harder variety of carbonate of lime, (namely, with marble,) broken into small pieces, nine ounces; muriatic acid, sixteen ounces; water, eight ounces. Mix the acid with the water, and gradually add the pieces of carbonate of lime. The effervescence being finished, digest for an hour. Pour off the fluid, and reduce it by evaporation to dryness. Dissolve the residue in its weight and a half of water, and filter the solution."

Calcis Muriatis Aqua, Dub. Water of Muriate of Lime.

"Take of muriate of lime, two parts; distilled water, seven parts. Dissolve. The specific gravity of this solution is to that of water as 1202 to 1000."

Syn. Dissolution de Muriate de Chaux (F.), Liquore di Muriato di Calce (I.).

This preparation is now properly named, for even in solution, the salt is a chloride of calcium.

Qualities. -This solution is colourless, and has a disagreeable, bitter, acrid, taste. It is decomposed by the sulphuric, nitric, phosphoric, fluoric, and boracic acids; the neutral salts into which these enter; and the alkaline carbonates, which precipitate the lime in the form of a carbonate.

Medical properties and uses.-Chloride of calcium is deob-struent and tonic. It was introduced into practice by Four-croy, and has been much recommended as a remedy in scrofulous and glandular diseases. I have given it with evident advantage in bronchocele; and have witnessed more benefit result from its continued use in the varied forms of scrofula, than from any other remedy. Its operation is similar to that of chloride of barium; but the danger of an over-dose is less to be dreaded, and its good effects are more uniform and certain. The dose of the solution is from xx. to f 3j., increased gradually to f3 iv., in a sufficient quantity of water or milk, repeated twice or thrice a day.

Officinal preparations. - Calcis Carbonas Praecipitatum, D.