I 170 X 



a. Commoner Native Sulphur ^ is a yellowifli fub* 

 fiance, odorate, electric, tranfparent, and o^lohe- 

 dral ; opaque and prifmatic ; fufible, and fubjeft to 

 different combufiions ; one is flow, with a bluilh 

 flame, and yields fulphureous acid ; the other ra- 

 pid, with a white flame, and yields fulphuric acid. 



b. Volcanic Sulphur ; amorphous, granular, com- 

 pact. 



E. PLUMBAGO, or Carbure of Iron ; or iroa 

 combined with a large portion of carbon, 



a; Common Plumbago ; Graphite; this fub- 

 ftance has not yet been produced by art, but na- 

 ture contains it in confiderable abundance ; fuf- 

 fers no change by water or atmofpheric air, nor 

 cxpofed to fire in clofe veffels ; but burns flowly, 

 if heated, in contafcl with air ; amorphous, fibrous 

 and flaty ; of a deep iron black colour; little min- 

 ing, metallic luftre, ftains the fingers, foapy to the 

 touch. 



. 



b. Anthracolith ; confi fling of Carbon 9 0. Ar* 

 jill 5. Iron g. Born. 



_ VOLCANIC 



