487
some other diseases; for example, scirrhus and Cancer, cutaneous diseases, bron-cho cele, &c. As a local application, a Solution of it has been used as a wash inherpetic eruptions, and as a collyrium in scrofulous Ophthalmia.
In pharmacy and chemistry it is extensively employed as a test for sulphuricacid and the suiphates.
Administration. —It is used in the form of aqueous Solution.
Antidotes. —The antidotes for the barytic salts are the suiphates, which formtherewith an insoluble sulphate of baryta. Hence, sulphate of soda, sulphate ofmagnesia, alum, or well or spring water (which contains sulphate of lime) shouldbe copiously administered. Of course the poison should be removed from thestomach as speedüy as possible. To appease any unpleasant Symptoms causedby the continued use of large medicinal doses, opiates may be employed.
LIQUOR BARH CHLORIDI, L. (ü. S.;) Solulio Barylce Muriatis, E.; Baryta;Muriatis Aqua, D.; Solution of Chloride of Barium. —(Chloride of Barium, 3j.;Distilled Water, f3j.; L. E. —Muriate of Baryta, one part; [3j. U. S.] DistilledWater, three parts,- [giij. U. S.] D. Dissolve.) Dose of the Solution of theLondon Pharmacopoeia, ten drops, gradually and cautiously increased until nauseaor giddiness is experienced. It is employed also as a test for sulphuric acid or thesuiphates. Common water, and all liquids containing suiphates, carbonates, orPhosphates in Solution, are incompatible with it
4. BARY'TiE NI'TRAS, £.—NITRATE OF BARYTA.
History. —This salt was formed soon after the discovery of baryta,
Preparation. —It " is to be prepared like the muriate of baryta [chloride ofbarimn, see p. 484,] substituting pure nitric acid for the muriatic acid."— Ph. Ed.
Properties. —It crystallizes in octohedrons. It is soluble in water, but insolu-ble in alcohol. It is decomposed, with decrepitation, by a bright red heat, andfurnishes pure baryta.
Characteristics. —As a nitrate, it is known by the tests for this class of saltsalready mentioned (see p. 267.) The characters of the barytic salts have beenbefore stated (see p. 485.)
Composition. —The crystallized salt is anhydrous. Its composition is as fol-lows:—
Moms. Eq. Wt. Per Cent. Berzelius.
Baryta............... 1
Nitric Acid.......... 1
7754
58-741'3
58-841-2
Nitrate of Baryta .
100 0 ........ 1000
Physiological Effects. —Similar to those of the chloride of barium.
Uses. —It is employed as a test. Fire-work makers use it to communicate agreen tinge to flame.
SOLUTIO BARYT7E NITRATIS, E. Solution of Nitrate of Baryta. (Nitrate ofBaryta, 40 grs.; Distilled Water, 800 grs. Dissolve the'salt in the water; andkeep the Solution in well-closed bottles.) Employed as a test for sulphuric acid.
Order XIV.— COMPOUNDS OP CALCIUM.
1. CALX, L. E. (U. S.)—LIME.
(Calx recens usla, D.)
History. —Lime, and the mod'e of obtaining it by burning the carbonate, wereknown in the most remote periods of antiquity. Hippocrates {Popularium, ii.sect. 5.) employed this earth in medicine. Dr. Black, in 1755, first explained thenature of the process for making it. In 1808 Davy showed that this substancewas a metallic oxide, and hence it has been termed the Oxide of Calcium. Todistinguish it from the hydrate of lime, it is called Caustic Linie, or Quicklime(Calx viva,) or Burma Lime (Calx usla.)