ARGENTUM. 63 



internally. The solutions of the Subacetate are the only liquid 

 preparations of the metal, and are used externally as lotions, 

 injections, collyria, etc., as well as in the form of the ointment. 

 The Oxide is made into Emplastrum plumhi, the basis of almost 

 all plasters. The Nitrate is used as a local stimulant or eschar- 

 otic, as described ; and pharmaceutically to obtain the Iodide. 

 The latter possesses, as already described, absorptive powers by 

 virtue of the iodine, an effect which the lead probably promotes, 

 Plumbi Carbonas is applied, either as the powder or as an 

 ointment, for astringent purposes, to ulcers and inflamed 

 surfaces. 



ARGENTUM. 108. SILVER. 



Two salts of this metal are officinal, the nitrate 

 and the oxide. 



Argciitiiiii Purificatum. Refined Silver. Pure 

 Metallic Silver. 



Impurities. Lead and copper. 



From Argentum is made : 



Argenti Nitras. Nitrate of Silver. AgN0 3 . Lunar 

 Caustic. 



Source. Made by dissolving Silver in Diluted Nitric 

 Acid. 



Characters. Colourless tabular right rhombic prisms, 

 or white cylindrical rods. Solubility, 100 gr. in 50 min. 

 of water. 



Impurities. Other nitrates ; detected by evapora- 

 tion of nitrate after precipitation with HC1. 



Dose. % to gr. 



From Argenti Nitras is made : 



Argenti Qxidum. Oxide of Silver. Ae:.,O. 



Source. Made by precipitating a solution of 

 Nitrate of Silver with Lime- Water 2A-N< )., + 

 Ca2HO = Ag 2 + Ca2NO 3 + H 2 0. 



Characters. An olive-brown powder ; insoluble} 

 in water. Incompatible with creasote, with whicU 

 it forms an explosive substance. 



Impurities. Metallic silver, evolving gas with 

 nitric acid. 



Lose.\ to 2 gr. 



