344 DRIFT ICE AS AN ERODING AND TRANSPORTING AGENT—PREST.. 
regions. The narrow channels through which the water flows 
from the north and northwest have been gradually getting 
shallower and narrower, and should the present elevating process 
continue the force and bulk of this current must be greatly 
lessened, if not altogether extinguished. 
There is much room for investigation in this subject; but 
circumstances compel me to leave to my more professional 
brethren the work of proving or disproving fully the conclusions. 
I have arrived at. 
