186 

 



186. MAGNESIUM SULPHATE. Mg S 4 , 7H 2 0. 



a. Crystallized, in large crystals. 



I. Ditto, in small acicular crystals, impure. (Epsom Salt.) 

 c. Ditto, purified. (Refined Epsom Salt.) 

 Note. Specimen a much resembles in appearance ordinary commercial 



specimens of oxalic acid. For fig., see Per. Mat. Med., vol. i., p. 656 ; 



Phillips, Transl. Pharm., 1851, p. 327. 



187. SULPHITE. Mg S 3 . 



a. Crystallized. 



188. SULPHOCARBOLATE. Mg (C 6 H 5 S 4 ) 2 . (Sulplioplienate of Mag- 



nesium.) 



a. Crystallized. 



ZINC. Zn. 



189. METALLIC. 



a. Granulated. 



b. Powdered. 



190. ACETATE. Zn C 2 H 3 2 . 



a. Commercial specimen. 



6. Long -well-formed large crystals. 



191. BENZOATE. Zn2C 7 H 5 2 . 



a. Acicular crystals. 



Note. This substance much resembles in appearance crystallized oxide 

 of antimony. 



192. BUTTRATE. Zn(C 4 H 7 2 ) 2 . 



a. Pure crystalline powder. 



193. CARBONATE. Zn C 3 . 



a. Pure precipitated. 



194. CHLORIDE. Zn C1 2 . 



a. Fused, impure. 



b. Ditto, freed from iron and other impurities. 



195. CHUOMATE. Zn Cr 4 . 



a. In yellow powder. 



196. LACTATE. ZnC 3 H 4 8 . 



a. White, minutely crystalline, mamillated crust. 



197. OXIDE. Zn O. 



a. Prepared by combustion of the metal. (Hubbuck's 



Oxide of Zinc.) 



b. Prepared by calcining the carbonate. (Zinci Oxidum, B.P.) 



c. Impure. (Tutia Praparata, Cadmia Fornacum, Tuthj 



Powder.) 



Note. Specimen c consists of the sublimate which collects in the flue 

 during the roasting of zinc ores. It usually contains cadmium. See Per. 

 Mat. Med., vol. i., p. 766. 



