238 J. W. Dawson on the Drift. 
over the Middle Silarian escarpment; an 
though less closely connected with the direction of the current, 
still under water, Then the valley of the Ottawa, that of the 
Mohawk, and the low country between Lakes Ontario and 
Huron, and the valleys of Lake Champlain and the Connecticut, 
would be straits or arms of the sea, and the current, obstructed 
in its direct flow, would set principally along these, and aet on 
th i oh northwest and southeast di- 
rtion of the process I would attribute the 
northwest and aah iati i iS vi 
ern America, though I must dissent from any view which would 
ae to them the principal agency in our glacial phenomena, 
Under a condition of the continent in which only its higher 
oreakers 18 visible almost to their summits; 22 
° observed in Canada and Nova Scotia many old 
ng 
; 
: 
