KDI'lORIALS. 201 



north of it, except at those points at which the later drift reaches 

 the border of the earlier. The moraines from which these high- 

 gradient trains of gravel take their origin lie between the two 

 areas of depression -deposits, and there is abundant and clear 

 evidence that they were later than the one and earlier than the 

 other. The phenomena connected with the earlier depression 

 should, therefore, be considered quite independently of the Cham- 

 plain depression. None of the agencies of the later depression 

 can be legitimately appealed to in explaining the formations of 

 the earlier depression. The confusion of the past, which is par- 

 donable, should be eliminated, and further confusion avoided by 

 the recognition of the distinctness of the two depressions. 



T. C. C. 



