16 AMMONIUM. ARSENI TRIOXIDUM. 



An official preparation is Trochisci Ammonii Chloridi. 



Official Preparations. 



Ammonium Benzoate ; dose, i Gm. Ammonium Bromide ; dose, i Gm. Ammon- 

 ium Iodide; dose, 0.3 Gm. Ammonium Salicylate; dose, i Gm. Ammonium Valerate; 

 dose, 0.5 Gm. 



The Bromide, Iodide, and Salicylate are generally considered inferior to the cor- 

 responding salts of sodium. The Benzoate is little used, while the Valerate is prac- 

 tically inert. 



ANTIMONII ET POTASSII TARTRAS. 



Tartar Emetic is made by suitably combining potassium bitartrate with the oxide 

 of antimony. 



Properties: 

 Appearance 



Color 



Odor 

 Taste 



Tartar Emetic used to be extensively employed as a nauseant and emetic, but 

 fortunately its use has been practically abandoned. 



ARGENTI NITRAS. 



Silver Nitrate (AgNOg) is prepared by treating pure silver with pure diluted 

 nitric acid, with crystallization. The salt should be kept in dark, amber-colored bot- 

 tles, away from light. 



Properties: 



Appearance 

 Color .. 



Odor 



Taste (cautiously) .... 



Solubility : 



Cold H 2 O 



Hot H 2 O 



C 2 H 5 OH ... 



Evaporate a drop of the aqueous solution on the hand 



Evaporate another drop on a porcelain dish 



Incompatibilities: Practically everything. 



Silver Nitrate is an efficient prophylactic for ophthalmia neonatorum, I drop of a 

 i % solution being placed in each eye of the newly-born infant. It is of great service 

 in the purulent conjunctivitis of adults. In general local application it is an efficient 

 germicide ; caustic in stronger solutions. Internally, it is somewhat rarely used in low 

 forms of gastritis and in gastric ulcer. Dose, o.oi Gm. 



Other official salts of Silver are : Argenti nitras fusus, containing 94.5% AgNOs 

 (lunar caustic) ; argenti oxidum, an unequal substitute for the nitrate. 



ARSENI TRIOXIDUM. 



White Arsenic, or Arsenous Acid, is a sublimation product obtained by roasting 

 arsenical ores. 



