1893- ON THE WORK OF GLACIERS. 61 



(as in Scandinavia, Finland, and North America) with great districts, 

 in which the terrain is for the most part made up of Archaean 

 crystalline rocks, in which therefore the traces of glaciation in high 

 latitudes are better preserved, and surface changes (including diffe- 

 rential movements) have been longest in progress, that has led to 

 some confusion of thought on this matter. 



A. Irving. 



