r *' 





and; 



It 



■ Jura 





I 



* ftf An 



• :ie foot i 

 ittvith 



*Vi 



e 



■ '0 enable a 



I 



nf£: 



I Jt ^:"fs or fraj'Er 



Jie fad that p 



L" 



J 



i 



'- 1 





alleges, tfe! ^ 



X 



HUTTONIAN THEORY. 



387 



vifibl 



!, are the fame from which that mountain 

 lible when thefe flones were tranfported hi- 

 ther. It may be, however, that the pafles which 

 now exifl in Mont Jura are the remains of vaU 

 leys or beds of torrents, which once flowed wefl- 



s atural, that the 

 untains fhou d be 



ard from th 



d 



fragments from the latt r m untains 



found in the neighbourhood of thofe ancient 



water-tracks. 



347. Sauffure obferved in another part of 

 the Alps, that where the Drance defcends 

 from the fides of Mont Velan and the Great St 

 Bernard, to join the Rhone in the Vallais, the 

 valley it runs in lies between mountains of pri- 

 mary fchiftus, in which no granite appears, and 

 yet that the bottom of this valley, toward its 



lower extremity, is for a confiderable way co- 

 vered with loofe blocks of granite *. His fa- 

 miliar acquaintance with all the rocks of thofe 

 mountains, led him immediately to fufped, that 

 thefe ftones came from the granite ch; 



which is weilward of the D 



of 



Mont Blanc, v 



h 



and confiderably higher than th 

 mountains. This conjecture was verified by 



intervening 



obfervations of 



of his friend 



w 



found 



the fi:ones in quefiion to agr 



Bb 2 



aiy 



rock 



* Voyages aux Alpes, torn, ii- § 1022 



