fHEORT of the EARTH. 237 



ON the other hand, heat being capable of rendering all thefe 

 fubftances fluid, they may be, with the greateft fimplicity, 

 tranfported from one place to another ; and they may be made 

 to concrete altogether, at the fame time, and diftinclly feparate 

 in any place. Hence, for the explanation of thofe natural ap- 

 pearances, which are fo general, no further conditions are re- 

 quired, than die fuppofition of a fufficient intensity of fubter- 

 raneous fire or heat, and a fufficient degree of compreffion upon 

 thofe bodies, which are to be fubjecled to that violent heat, 

 without calcination or change. Exit, fo far as this fuppofition 

 is- not gratuitous, the appearances of nature will be thus ex- 

 plained. 



I SHALL only mention one fpecimen, which rmift appear 

 mofl decifive of the queflion. It is, I believe, from an Hun- 

 garian mine. In this fpecimen, petro-filex, pyrites, and cin- 

 nabar, are fo mixed together, and cryftallized upon each other, 

 that it is impoflible to conceive any one of thofe bodies to have 

 had its fluidity and concretion from a caufe which had not af- 

 fecled the other two. Now, let thofe who would deny the fu- 

 fion of this filiceous body explain how water could diflblve 

 thefe three different bodies, and depofit them in their prefent 

 fhape. If, on the contrary, they have not the leaft fhadow of 

 reafon for fuch a gratuitous fuppofition, the prefent argument 

 mud be admitted in its full force. 



SULPHUR and metals are commonly found combined in the 

 mineral regions. But this rale is not univerfal j for they are 

 alfo frequently in a feparate flate. There is- not, perhaps, a 

 metal, among the great number which are now difcovered, that 

 may not be found native, as they are called, or in their metallic 

 flate. 



METALLIC fubftances are alfo thus found in fome proportion 

 to the difpofition of the particular metals, to refift the minera- 

 lizing operations, and to their facility of being metallized by 

 fire and fufion. Gold, which refufes to be mineralized with 



fulphur, 



