HUTTONIAN THEORY. 



61 



k 



ence, which he remarked between the native 

 and the artificial regulus^ to the different energy 

 with which the fame agent works when em- 

 ployed by nature and by art *. 



54. All thefe appearances confpire to prove. 



the mate 



hich fill the mineral veins 



were melted by heat, and forcibly injeded, ii 

 that Itate, into the clefts and fifiures of the flra 



ta. 



Thefe fill 



w 



ft conceive to h 



arifen, not merely from the flirinking of the 

 ilrata while they acquired hardnefs and folidity, 

 but from the violence done to them, when they 

 were heaved up and elevated in the manner 

 which has already been explained f . 



55. When thefe fuppofitions are once admit- 

 ted, the other leading fads in the hiftory of me- 

 tallic veins will be readily accounted for. Thus, 



it is evident to what v/e mull 

 afcribe the fragments of the furrounding rock 

 that are often found immerfed in the veins, and 

 encompalfed on all fides by cryfi:allized fubftan- 

 ces. Thefe fragments being no doubt detached 

 **l)y the concuffion, which at once tore afunder 

 and elevated the ft rata, were fuftained by the 

 melted matter that flowed at the fame time up- 

 ward 



for 



inilance. 



* Theory of the Earth, vol. i. p. 68. Journal de Phjf, 

 Janvier 1786. 



t Note xiii 



