c m i 



than the purified metal ; of particular fhapes ; a- 

 morphous, granular, compacV 4naL Nickel 

 united to iron, arfenic, cobalt, and fulphur. Berg- 

 man* 



C. ARSENIC. 



ARSENIC is about eight times heavier than 

 water, appears in plates of a bluifh grey colour, 

 may be difcovered by evaporating it upon red- 

 hot coal or iron, by means of which a garlic 

 fmell is emitted. The fumes depoht a white 

 coating on a plate of copper. It is. not acted up- 

 on by water, but readily by nitric acid. Phio- 

 gifticated alkali dropped into it's folution, pro- 

 duces a green precipitate. 



a. Native Arsenic , Teftaceous Arfenic ; arfe- 

 nic alloyed by iron. It is generally found in co- 

 balt mines, in Saxony, Bohemia, Norway. 



b. Native Oxyde of Arsenic y White Oxyde of 

 Arfenic ; this is fcarce, of a whitifh colour, but 

 expofed to heat becomes blackifh. It is foiuble 

 in water affifted by heat; alfo in nitric acid, left 

 fo in muriatic and vitriolic acid. Found in Hun- 

 gary, on the Hartz, in Bohemia, and Tranfylva- 

 nia. 



c. Sulphur et of Arsenic, Sulphurifed Arfenic, 

 Realgar, yellow Orpiment; of a yellow brimftone 

 colour, inclining to orange ; it's texture ufually 

 lamellar, and To foft as to be cut with a knife, and 



a little 



* 



