30'^ 



ILLUSTRATIONS OF THE 



SaulTure met with granite veins in the Valor- 

 fine, but did not fee them diftindly. -He afcrib- 

 ed them to infiltration *. The date of this ob- 

 fervation is in 1776 : He afterwards difeovered 

 limilar appearances at Lyons f. 



Werner alfo, in enumerating the fubftances 

 of which veins are formed, reckons granite as 

 one of them. 



273. Veins of granite maybe confidered as of 

 two kinds, according as they are connedted, or 

 not connected apparently with any large mafs of 

 granite. It is probable, that thefe two kinds of 

 veins only differ in appearance, and that both 

 are connected with maffes of the fame rock, 

 though that connection is vifible in fome inftan- 

 ces, and invifible in others. The diftindion, 



I- 



however, whatever it be with refpedt to the 

 thing obfervcd, is real with refped to the ob- 

 ferver ; and, as it is right, in a defcription of 

 fads, to avoid every thing hypothetical, I Ihall 

 fpeak of thefe veins feparately. 



274. Veins of granite, having no communica- 

 tion, fo far as can be difeovered, with any mafs of 

 the fame rock, are found in the Weftern If- 

 lands of Scotland, particularly in that of Coll, 



1 



where 



* Voyages aux Alpes, torn. i. § 598, 599. 



t Ibid § 601. 



