^' 



'■^ 



don 



mi 



ne 



an/ 



^fii 



ttUTTONlAN THEORY. 293 



lar to thofe that lie under it. Now 



P 



pears altogether unaccountable, that after the 

 water had done depofiting the materials of the 

 whin on the fpot in queftion, the former order 

 was fo quickly refumed, and a depofition of 

 fand, and of the other materials of the ilrata, 

 took place jull as before. All this is quite un- 



Qit.ojj, intelHgible ; and the principles of the Neptu- 



Wii|,5| ^^^^ fyftem feem here to ftand as much in need 



Ubij., of explanation, as any of the appearances which 



rv \^^ they are intended to account for. 

 havepr ^^^' ^^^ unequal thicknefs, and great irre- 

 tlieli S^^^'^^^y ^" ^^^ f^irface of the whinilone maf^, 



here treated of, and of many rocks of the fame 

 kind, is alfo a great objection to the notion of 

 their aqueous formation. This feeras to have 

 been perceived by Werner, in the inftance of 

 placeiJi. ^jjg j.Q^l^g formerly mentioned ; and he endea- 

 vours to explain it, by fappofmg, that much of 

 thefe rocks has been deftroyed by walle and de- 

 [k/2''' compofition, fo that an irregularity of their fur- 

 ^aif face, and want of correfpondence has been given 



to them, which they did not originally poflefs. 

 In the inftance of Salifbury Craig, however, we 

 have a proof, that the great irregularity of fur- 

 face, and the inequality of thicknefs, do not al- 

 ways arife from thefe caufes. The thinneft part 

 of that rock, toward its northern extremity, is 



T ^ ■ ftill 



/ 



