163 INORGANIC AGENTS 



Incompatible s. — It is incompatible with most substances. 



Dose.—n. & C, gr.v-vii, (.3-.5); Sh. & Sw., gr.ii, (.12); D., gr.1/80-1/8, 

 (.002-.008). 



Hydrakgyri Chloridum Mite. Mild Mercurous Chloride. HgCl. (U. S. P.) 

 (Calomel, Mild Chloride of Mercury.) 



Synonym. — Hydrargyri subchloridum, B. P.; hydrargyrum chloratum, P. G.; 

 mild or mercurous chloride, subchloride or protochloride of mercury, E. ; proto- 

 chlorure (sous-muriate) de mercure, calomSle, Fr. ; quecksilberchloriir, calomel, G. 



Derivation. — Heat mercurous sulphate and sodium chloride. Calomel sublimes. 

 Hg, S0,-|-2 Na Cl = 2 HgCl+Na,SOi. 



Properties. — A white, impalpable powder, becoming yellowish-white on being 

 triturated with strong pressure, and showing only small isolated crystals when 

 viewed with a lens having a magnifying power of 100 diameters. Odorless and 

 tasteless; permanent in the air; insoluble in water or alcohol. When 'strongly 

 heated it is wholly volatilized without melting. 



Dose.—li., 3ss-i, (2-4); C, 3v-vi, (20-24); D., gr.ss, (.03), in divided doses; 

 D., gr.iii-v, (.2-.3) in single doses. 



PREPAKATIOIf. 



Pilulce Catharticce Compositce. Compound Cathartic Pills. (U. S. P.) 

 Compound extract of colocynth, 80; calomel, 60; resin of jalap, 20; gamboge, 

 15; diluted alcohol, q. s. to make 1,000 pills. 

 Hose.— D., pill 1 to 3. 



Hydrargyri Iodidum Rubrum. Red Mercuric Iodide. Hglj. (U. S. & B. P.) 

 (Bimodide of Mercury, Bed Iodide of Mercury.) 



Synonym. — Hydrargyri biiodatum, P. G. ; deutoiodide of mercury, mercuric 

 iodide, E.; deut-iodure (bi-iodure) de mercure, iodure mercurique, Fr.; rothes 

 jodquecksilber, quecksilberjodid, G. 



Derivation. — Mix aqueous solutions of corrosive mercuric chloride, 40 Gm., 

 and potassium iodide, 60 Gm. The red iodide is precipitated. Filter, wash and 

 dry. HgClj+2 KI = Hgl^-f 2 K CI. 



Properties. — A scarlet-red, amorphous powder; odorless, nearly tasteless, and 

 permanent in the air; almost insoluble in water; soluble in 115 parts of alcohol. 



Ukguentum Hydrargyri Nitratis. Ointment of Mercuric Nitrate (Citrine Oint- 

 ment). (U. S. & B. P.) 

 Mercury, 71 Gm.; nitric acid, 17.5 Gm.; lard, 76.0 Gm. (U. S. P.) 

 Properties. — A lemon-yellow ointment. 



Hydrargyrum Ammoniatum. Amraoniated Mercury. HgNHjCL 



(U. S. & B. P.) 



(White Precipitate, Mercuric Amm,omum Chloride.) 



Synonym. — Mercurius prsecipitatus albus, E.; oxychlorure ammoniacal de 



mercure, mercure pr6cipite blanc, Fr. ; weisse quecksilber-priicipat, quecksilber- 



chloridamidid, G. 



Derivation. — Mix an aqueous solution (1 to 20) of corrosive mercuric chloride, 

 2000, with ammonia water, 150. 



Properties. — White, pulverent pieces, or a white, amorphous powder, without 

 odor, and having an earthy, afterwards styptic and metallic taste; permanent in 

 the air; insoluble in water or in alcohol. 



preparation. • 

 Unguentum Hydrargyri Ammoniati. Ointment of Amraoniated Mercury. 



(U. S. & B. P.) 

 Synonym. — White precipitate ointment. Amraoniated mercury, 10; white 

 petrolatum, 50; hydrous wool-fat, 40. (U. S. P.) 



General Action of Mercury and Its Salts. 



External. — The salts of mercury are antiseptic, germicidal, irritant 

 and — in the case of the soluble f alts — caustic, when applied to raw sur- 



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