VI THE GORGE OF THE AAR AND ITS TEACHINGS 145 



part of its rim at Bingen. This basin is filled (not with 

 lacustrine, but) with fluviatile deposits alone, showing 

 that the process of infilling has kept pace with the move- 

 ment of depression.] Lake Zurich, I would only add, is 

 the bed of the old Linth glacier, and its dimensions are in 

 proportion to those of that extensive ice-stream. The 

 lacustrine hollow has obviously been excavated in the 

 valley of the Linth long after that river had cut its way 

 across the crustal deformations I have referred to." 



The account here given of Aeppli's work shows that he 

 adduces no evidence whatever of the existence of the 

 alleged deformation, but only an assumption of an earth- 

 movement sufficient to account for the formation of Lake 

 Zurich. There is, however, the clearest evidence of another 

 earth-movement on the very site of the lake in question, 

 but in the opposite direction — that is, an elevation instead 

 of a depression, through which the old river Linth cut its 

 way as fast as the ground rose ; and, subsequently, what 

 had been the crown of the elevated ground was covered 

 by the Linth glacier, and now forms the centre of the 

 lake ! It will, I think, be admitted that my critic was 

 hardly justified in his accusation of " special pleading " on 

 my part. 



VOL. 1. 



