tt 



^i^^ 



^ 



u 



I 



^l.' 



Ot 



% 



I 



\i 



\ 



"-'i^ 



5[i 





■Ctr.'^ 



'■^ 



'^'^ of tile 



6 parallel tiii 



•vi: 



* UtC 



Col de la Se 



fifilj'; 



IS nearly ii; 



t D::!a 



s 





f" 'W rearijaiffl 



I UiC 



Alps, aoi ti 



FftHD the 



U argued 



V£If 



; 



-rtf^ 



"erniDJ 



• 



t0' 



-,rds one "" 





^ffl. 



HUTTONIAN THEORY. 



403 



current of a debacle^ that current muffc cither 

 have run in the direiflion of the valley of Ferret, 



that of the Dorea, which iiTues from 



If 



had the diredion of the firfl, it could not cut out 

 thefecond ; and if it had the diredion of the fe^ 

 cond, it could not cut out the firft. Belides, the 

 force which excavated this valley muft have been 

 nothing at the two extreme points, viz. at the Col 

 de Segne and the Col de Ferret, and muft have 

 increafed with the diftance from each. It can 

 have been produced, therefore, only by the run- 



ning of two ft 

 furface th 



at 



•earns in oppofite diredions 

 was but flightly uneven, 



fe 



ftreams at meeting taking a new direct 



ght 



gles to the form 



A clearer 



proof could hardly be required than is afforded 

 in this cafe, that what is now a deep valley was 

 formerly folid rock, which the running of the 

 waters has gradually worn away; and that 



the waters, wh 



ey beg 



to 



we 



high, at leaft, as the tops of thofe m 



oftbeW"'^"'! ^^^"^ ^y which the valley is bounded 



d 



the lower lid 



Longitud 



y 



ith the w 



11; 



1 



burfting out tranfverfely from their fides, like the 

 preceding, are by no means confined to moun- 



;r. We have a very good 



f the firft ord 



pie, though on a fm 



fcale. 



of th 



furt 



thi 



fe 



3f a V 

 of Ed 



1 



C G 2 



burgh. 



P* 



■IV" 



