44 W* BEDS 



fecond was far from being a pure pyrites being 

 plainly enough mixed with the above filver-ore - 9 

 which, and not the peculiar iubftance of the 

 pyrites, was the ground, whence as from a 

 root, the native .filver, upon a narrower infpec- 

 tion, appeared to proceed. And how can wc 

 cXpcEt to have filver growing from pyrites, when 

 we know pyrites, as fuch, to hold little filver, its 

 filver generally amounting only to h {> i,at moll 

 2. drams the quintal, and confequcntly no filver 

 growing out of it : And hence may be deduced thefe 

 i! fefal truths •, i. that pyrites, efpecially the pure 

 iulphur and iron pyrites cannot be the mother, or 

 producing matter of the nobler metals, as many 

 might imagine from its univerfal fpread-, for in- 

 flance, here in Tvlifma, it always accompanies filver- 

 ores, and appears necefTary to their generation and 

 encreafe. 2. That in judging of veins and ore, we 

 are not tp fuppofe that matters accompanying, 

 or even intangled with each other, proceed 

 the one from the other •, but we are rather to look 

 on their fubftances, either produced at the fame 

 time, or meeting together afterwards. And if pyrites 

 have no generative, they can not be endued with 

 a conceptive power for filver. Grown or native fil- 

 ver, fo far as I know, and have had inftances, is 

 found on quartz, /pad, Jhiver, kneifs*, ochre, jafper 9 

 and all manner of horne-ftone, on gemfs and glimmer, 

 on common quarry ftone and knawer. Among 

 ores, chiefly on fmalt cobald (to find it on red-goldi/b y 

 glaffy, and vohitc-goldifh pre is not uncommon) a 

 peculiar inftance of which we have in the fmalt" 

 cobald of Lacray in Lorrain. Fibres of filver are alfo 

 fometimes found in and upon iron- (lone ; but on 

 pyrites, either white, yellowifh, or yellow, as fuch, 

 never, or at leait it has not hitherto been heard off. 



There 



* A black, fatty fort of vein-Hone or rock. 



