ILLUSTRATIONS OF THE 



th 



principle of compreffion, fuch 



It 



cfown by Dr H 



d 



it was hardly poffible fo 



Iiira to proceed further than he has d 



remarked the 



me. He 



bur?it limeftone that lies on th^ 



tops of fome of the Euganean bafaltes, and H 



been aware of th 



fficulty, which 



come, 

 general 



ferved for the Huttonian Theory t( 

 His letter contains alfo fome ex^ 

 rem. arks on the rocks of the V 



rais 



d Velay, which he had vifited, before Faujas 

 St Fond had publiflied his curious 



and 



borate defcription of thefe 



39. The caufe of the peculiar ftruaure which 



lias j.ull been obferved to 



from volcanic conn trips 



diftinguifh whinft 

 eafily affigned 



Huttonian Theory. According to that theory, th 



ft 



rocks 



formed 



the earth, of melted mat 

 and openings of the ft 



the bowels of 



in 



poured into th 



I 



They 



fore, in thofe openings, as in a mould 

 i'-ed the impreflion and charader c 



were caft 



; and 

 f the 



rocks by which they were furrounded. Hence 



tliQ tabul 

 foft have 



oj. 



a 



bee 



aflTes of whinfto 

 I interpofed bet 



hich 

 ftrat 



hen 

 d 



an 



comprefTed by their weight, fo as almoft to ha 

 themfelves acquired the appearance of ftratific 

 tion. Hence the perpendicular faces of the fai 



f 



rocks, produced by their being abutted v/h 



yet 



/ 



