220 T. C. CHAMBERLIN — GLACIAL STUDIES IN GREENLAND. 



with its glaciation or not. Aside from the contours of the plateaus and 

 valleys, which seem to indicate a fashioning rather by meteoric agencies 

 than by pronounced glaciation, the driftless area appears to afford the 

 most specific ground for induction. Bearing in mind that this is a small 

 area between the present edge of the ice and sealevel, which would be 

 overridden easily and completely by an advance of the ice-edge of less 

 than five miles, it seems necessary to conclude that at the time of the 

 former greater elevation the climatic agencies of glaciation could not 

 have been what they are now, for the increased elevation would have 

 caused an extension sufliicient to overwhelm the little driftless area. If 

 it is safe to conclude that elevation favors glaciation, then it is necessary 

 to conclude that during any period of previous glaciation there was here 

 no elevation sufficient to cause an advance, unless accompanied by coun- 

 teracting adverse climatic conditions. The raggedness of Dalrymple 

 island bears similar testimony. The general angularity of the coastal 

 mountains of south Greenland throw the weight of their evidence in the 

 same direction. It would appear, therefore, that the former elevation of 

 Greenland was not coincident with conditions favoring glaciation. 



