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HUTTONIAN THEORY. 155 



and the crofs vein are forced out of their place 

 by a third. Thefe difturbances arife not only 

 from mineral veins, but from veins of porphyry 

 and granite, the production of which has been 

 attended with no lefs violence than of the 

 others. 



227. What is here faid of Cornwall, is the 

 hiftory, in fome degree, of all mineral countries 

 whatever. The great horizontal tranjlation 

 v/hich has thus accompanied the formation of 

 veins ; the movement impreiTed on fuch vail 

 bodies of rock, and the frequent renewal of thefe 

 immenfe convulfions ; are not to be explained by 

 n^nie: the mild and tranquil dominion of the watery 

 witlii;: element. They require the utmoil power that is 

 ni ak known any where to exilt, and were it not for the 



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, ares admonitions of the volcano and the earthquake, 

 3votlf we might doubt if even fubterraneous heat itfelf 

 iod ti: poffefled an energy adequate to thefe aftoniih- 



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ing efFed:s. 



Qfi|j; 228. From the heaving of one vein by ano- 



[jgcfC ther, it is evident, that there was a force of pro- 



trufion in the diredion of one of them, that 

 aded at the time of its formation. This force 

 cannot be accounted for on the fuppolition that 

 vems were produced by the mere ilirinking of 

 the ftrata \ for the rocks could not, in that cafe, 

 have been rent afunder, and impelled forward at 

 the fame time. It appears moil likelv, that fif- 



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