SALICIN 491 



Salioinum. Salicin. C,,'B.„0,. (U. S. & B. P.) 



A neutral principle (glucoside) obtained from several 

 species of Salix and Populus (nat. ord. Salicacese). 



Habitat. — Europe, but cultivated in North America. 



Derivation. — Obtained from a decoction of willow bark. 

 Salicin crystallizes on evaporation, after removal of tannin 

 by agitation with lead oxide. It is purified by repeated 

 solution and crystallization. 



Properties. — Colorless, or white, silky, shining crystal- 

 line needles, or a crystalline powder ; odorless, and having 

 a very bitter taste. Permanent in the air. Soluble in 28 

 parts of water, and in 30 parts of alcohol ; almost insoluble 

 in ether or chloroform. 



Dose.— IS... & C, 3ii.-ii. (8.-30.); Sh., 3i.-iv. (4-15.); 

 Sw., 3 ss.-i. (2.-4.) ; D., gr.v.-xxx. (.3-2.). 



*SoDn Salicylas. Sodium Salicylas. Na CiHjOs 



(U. S. & B. P.) 



Synonym. — Silicylate de sonde, Pr.; natrium salicyli- 

 cum, G. 



Derivation. — Made by the action of salicylic acid on 

 sodium carbonate. 2 HC,H,03 + Na.OO, = 2 Na C,H,0, + 

 HjO + COj. The solution is filtered, and heated to expel 

 carbon dioxide. 



Properties. — A wliite, amorphous powder; odorless, and 

 having a sweetish, saline taste. Permanent in cool air. 

 Soluble in 0.9 part of water, and in 6 parts of alcohol ; very 

 soluble in boiling water or alcohol ; also soluble in glycerin. 



Dose. — Same as salicin. 



Phenylis Salicylas. Phenyl Salicylate, CsB.fi,B.^O, 

 (U.S. P.) 

 Synonym. — Salol, B. P.; salicylic ether of phenol. 

 Derivaiion. — Made by heating salicylic and carbolic 

 acids with phosphorus pentachloride. 



Properties.— A white, crystalline powder ; odorless, or 



* Strontii salicylas and lithii salicylas are now official. Strontium 

 Balicylate is less irritating to the stomach and lithium salicylate com- 

 bines action of lithium salts. Doses same for both as for the sodium salt. 



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