*3 8 Of the Gold 



{2 ,) As procurable by the aid of additions i 



And, (3.) As an cver-Jbot, or overplus, not dif- 

 coverable in the common method of proof. 



As to the fir ft, I /hall wave the queftions rela- 

 tive to the prefence and eduction, and only leave 

 to reflection, why copels, that have been in ufe, 

 and thus are become glazed with lead, yield upon 

 re-fufion, more filver than the lead-grain of fuch 

 lead originally amounted to ; and whether ever 

 any one allayed his lead for gold? The effects of 

 lead and cupellation, are, certainly, confiderable ; 

 feeing thereby, the noble metals are penetrated fo 

 much, that not the leaft of an ignoble fort can 

 efcape the action thereof, but muft needs be dif- 

 charged and expelled : and what a degree of mu- 

 tual action and re-action muft there not befides 

 happen among the pyrites- particles themfelves, 

 either in the courfe of a roafting, or of the incoc- 

 tion itfelf ? 



With much more propriety may the queftion 

 be urged •, when gold is procured from pyrites, 

 where, by the common proof,' there is none at all, 

 or in contradiction to it, an overplus is found : 

 inftances of which I could ailedge from my own 

 experience. And from hence we learn, if nothing 

 elfe, at leaft here to diftinguifh what is poflible in 

 nature: and I have repeatedly faid, that it is both 

 poilible and feafible to a (lift nature by means of ad- 

 ditions, but not without labour and expence : yet 

 after all the good hints I have here and there 

 dropped, for working pyrites ■, minerals, and me- 

 tals in this view, I cannot omit adding fomething 

 further : as that the gold educed in the common 



way 



