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found overlaying the tools of workmen in old galleries of 

 mines. See the 3d Letter of Baron Trebra, in his Treatife 

 ©n the Internal Strudure of Mountains. 



3dly, " Several metals have been found native." May not 

 they have been fo originally ? 



4thly, " Manganefe has been found in a reguline ftate by 

 *' Mr. De La Peyrouze, and in fmall grains, as when produced 

 " by fire." True ; but it was mixed with a large quantity of 

 iron, which is often found in that form without any fufpicion 

 of fufion. A fire capable of melting quartz might furely produce 

 it in larger mafles. 



jthly, " Spar, quartz, pyrites, and other minerals, are 

 " found varioufly intermixed, cryftallized upon or near each 

 •' other, and adhering to coal, or mixed with bitumen, &c. 

 " circumflanccs that cannot be explained in the hypothefis of 

 •' folution in the moift way." Not exadtly, nor with certainty ; 

 which is not wonderful : bvit they are ftill lefs explicable in 

 the hypothefis of dry folution, as mufl be apparent from what 

 has been already faid. How coal, an infufible fubftance, could 

 be fpread into flrata by mere heat, is to me incomprehenfible. 



6thly, " Dr. Black found mineral alkali cryftallized, yet 

 " deftitute of water of cryftallization, which could not happen 

 " unlefs it were cryftallized by fufion." What then will our 

 author fay of the vaft mafles of this fait which are fpund with 



their 



