230 Elements of Mineralogy, 



Hence I chufe to follow the common 

 guage, which, without very cogent reafons, 

 fhould never be departed from. 



7. All metallic fubftances are therefore of 

 neceflity {lightly dephlogifticated when united 

 to fulphur ; but as metallic calces, in their 

 moft dephlogifticated ftate, are allb capable 

 of uniting with fulphur, hence it happens 

 that they are fometimes more and fom^times 

 lefs dephlogifticated in various fulphurated 

 ores, particularly the pyritous. 



8. Metallic fubftances mineralized by fixed 

 air are alfo fometimes more and fometimes 

 lefs dephlogifticated. 



9. Metallic calces always containing fome 

 foreign ingredient afford a fmaller weight 

 when reduced ; and it is this laft that is 

 moftly denoted, and when the proportion of 

 pietal in any ore is affigned. 



CHAP. L 



Gold. 



i. The diftin&ive characters of gold arc 

 the following : i- A fpecific 1 gravity reach- 

 ing to 19,64. 2 dly * Infolubility in all acids, 

 except aqua regia, and the dephlogifticated 



marine 



