/ 



"^ 



320 



ILLUSTRATIONS OF THE 



to confider as a proof, that the fchiflus is 

 greater antiquity than the granite. Such alfo 

 feemed to me fome pieces of granite, which I 

 met with in Cornwall, near the Land's End • 



d others which I fa 



Ayrfh 



loofe 



blocks, on the fea-coaft between Ayr and Gir 

 van. It is impoffible to deny that the contain 



ing ft 



is more modern than the contained 



The Neptunills indeed adm 



th 



b 



alleg 



that all granite is 



to be true, 

 of the fame 



format 



d that, though fome granite 



the gi 



part boafts of 



highell 



tiquity which belongs to any thing in the fof 



111 kingdon 

 hypoth 



This diftindtion, however, is pure 



it is a fid 



trived on 



purp 



fe to reconcile the fad here mentioned 



with the general fyftem of aqueous depofition 



and has no fupport from any other phenome- 



non. 



2. Granite of Portfoy. 



Th 



g 



of Portfoy is one of the 



moft Angular varieties of th 



fto 



and is re- 



markable for this circumftance, that the felt- 

 fpar is the fubliance which has affiimed the fi- 



'a 



gure of its proper cryfial, and has given its form 



■ to 



