X04 



ILLUSTRATIONS OF THE 



a fmall part of the progreffion can leave 

 any diftina memorial behind it, and that there 



is no reafon to think, th 



th 



we fee. th 



ning is included 



part which 



mm 



In the fame manner, when a river under- 

 its banks, it often difcovers depofites of 



fand and 



g 



th 



hav 



been mad 



ran on a higher level th 



it d 



I 



oth 



ft 



at prefent 



the fame ftrata are* fee 



both the banks, though the bed of the river is 

 now funk deep between them, and perhaps 



hold 



s 



as winding a courfe through the 



rock, as if 



flowed along the furface 



folid 

 proof 



that it muft have begun to fmk its bed, when 

 ran through fuch loofe materials as oppofed but 



a very i 



iiderabl 



liftance to its ft 



A river, of which the courfe is both ferpentine 

 and deeply excavated in the rock, is among the 



ph 



by which the flo 



afte of the 

 are moft 



land, and alfo the caufe of that wafte, are 

 direftly pointed out. 



102. It is, however, where rivers iftue through 

 narrow defiles among mountaihs, that the iden- 

 tity of the ftrata on both fides is moft eafily re- 



ked at 



fame time with 



gnifed, and 

 the grcateft wond 



towmack, where it penetrates the ridge of the 



On obferving the Pa 



All 



gany m 



or the Irtifh, as it ilfu 



from the defiles of Altai, there is no man. h 



4 



ever 



* Note X'^ri. 



i 



.flk 



