C 140 ] 



a. Native Silver ; found generally of about 16 

 carats ftandard. 



b. Arsenical Silver; cryftallized with arfenic 

 and iron. 



c. Horn Silver ; refembling refm in colour, con- 

 taining muriatic acid, fulphuric acid, iron, argill, 

 and lime. 



d. Vitreous Silver, or Glafs filver ore, of a dark 

 colour like, lead ore, contains fulphur, is du&ile. 



e. Brittle Vitreous Ore, contains iron, antimo- 

 ny, fulphur, copper and arfenic* 



f. Red Silver Ore; a brittle red-coloured ore, 

 containing regulus of antimony and fulphur, and 

 fulphuric acid. The filver is in proportion of 62 

 to 100. Klaproth. 



g. White Silver Ore ; combined with lead, 

 antimony, fulphur, iron, filex, argill; of a light 

 grey colour, and of a dull fteel-grained texture. 



E. LEAD. 



LEAD is above 11 times heavier than water, 

 unfonoTOus, malleable, and very fufible, foluble 

 in all acids and alkaline folutions. It yields an 

 oxyde more vitrifiable than the oxyde of any 

 other metal^ and a glafs of a topaz-yellow colour. 



a. Native 



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