182 INOEGANIC AGENTS 



drachm for dogs. Oollargol appears to be non-toxic when 

 given intravenously or by inunction, if used with reasonable 

 care. 



Ziucum. 



[Zinc is not used in Bledicine in the metallic state.) 



ZiNCi Chloeidum. Zinc Chloride. ZnCl,. (U. S. &B.P.) 



Derivation. — Dissolve zinc in hydrochloric acid by boil- 

 ing. The solution contains the zinc chloride with chlorides 

 of iron and lead as impurities. These are precipitated by 

 adding first nitric acid then zinc carbonate. Filter and 

 finally evaporate. Zn, + 4 HCl = 2 Zn CI, + 2 H,. 



Properties. — A white, granular powder, or porcelain- 

 like masses, irregular or moulded into pencils ; odorless ; of 

 such intensely caustic properties as to make tasting danger- 

 ous unless the salt be dissolved in much water, when it has 

 an astringent, metallic taste ; very deliquescent ; reaction 

 acid ; soluble in about 0.3 part of water ; very soluble in 

 alcohol. 



LiQUOE ZiNCi Chloeidi. Solution of Zinc Chloride. 

 (U. S. & B. P.) 



Derivation. — Made as above with the addition of water. 

 It contains about 50 per cent., by weight, of zinc chloride. 



Properties. — A clear, colorless liquid, odorless, having a 

 very astringent, sweetish taste and an acid reaction. Spec, 

 gr. about 1,535 at 15° C. (59° F.). 



Toxicology. — Zinc chloride is a powerful irritant if swal- 

 lowed in any degree of concentration, and will, therefore, 

 produce gastro-enteritis. Emetics or the stomach pump 

 should be used, followed by demulcents and sodium bicar- 

 bonate. 



Uses. — Zinc chloride is employed in a paste made into 

 small pieces with flour ; or on lint soaked in a saturated 



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