286 



ILLUSTRATIONS OF THE 



prod 



Th 



fairell 



ay 



take Mr Wer 



obfervations juft as they are g 



to try whethe 

 out the affift 

 the wacken v\ 

 feem 

 jt n 



on an 



ven us, and 



ey cannot be explained \vith> 



of his theory. In ttYtd:, 



I he defcribes, refts, it would 



•nfoliddted bed of clay ; 



ay be fuppofed, that a 



has been converted into 

 the incumbent mai's. ar 



pa 



f th 



and 

 bed 



apparent gradatic 

 the other. As th 



fr 



wacken by the heat of 

 d has thus produced the 

 m the one fubllance to 



appearances of th 



cks of 



Scheibenberg feem to be c'onfidered by Werner 

 as furnifhing a very ftrong, and even an unex- 

 pe6led confirmation of his fyflem, I cannot help 

 thinking, that an explanation of them, on the 



principles of Dr H 



thout any ftraining 



^ 



or forcing of thofe principles, contributes not a 

 little toward extending the empire of the latter 

 over all the phenomena of geology. 



252. Another fa6l, which has been much infift- 

 ed on of late, in proof of the aqueous formation 

 of bafaltic rocks, is that fliells are found in 

 them. Of the reality of this faft, however, 

 or at lead of the inftances hitherto produced, 

 great doubts I think may be reafonably enter- 

 tained. The fpecimens of the fuppofed bafaltes, 



with fhells included in them, that are chiefly 



relied on, are found at Portrufh in Ireland, 



a rocky promontory to the wellward of the 



Giant's Caufeway, and feparated from it by a 



confiderahle 



