598 DEPARTMENT OF THE INTERIOR 



2 GEORGE V., A. 1912 



of British Columbia and Alberta. The more important new facts are sum- 

 marized in the diagrammatic section of Plate 49>. Because of the limited 

 area covered by the Boundary survey almost no pertinent facts have been added 

 to the important, theory of drainage modification in the Cordillera through 

 glaciation. Willis's acute discussion of this topic, though it covers only a rela- 

 tively small part of the glaciated tract, is still the most important contribution 

 to this subject. A further study on the same line is only one of the many 

 repaying subjects for investigation by glacial experts in the Cordillera. 



