J. W. Dawson on the Drift. 237 
be settled, in answering these questions, is the direction of the 
force which caused the strie. Now, ave no hesitation in as- 
serting, from my own observations, as well as from those of 
others, that for the southwest striation the direction was from the 
ocean toward the interior, against the slope of the St. Lawrence 
valley. The crag and tail forms of all our isolated hills, and the 
direction of transport of boulders carried from them, show that 
throughout Canada the movement was from northeast to south- 
vailing set of strie; for we cannot suppose a glacier moving 
f from the Atlantic up into the interior. a the other hand, it is 
eminently favorable to the idea of ocean drift. A subsidence of 
} America, such as would at present convert all the plains of 
Canada, and New York, and New England, into sea, would de- 
termine the course of the Arctic current over this submerged 
present Arctie current along the American coast has its deep 
Lahore as well as its sand-banks. Our American lake basins 
were admitted, there is no height of land to give them momen- 
tum. But if we mabpiee ‘he land submerged so that the Arctic 
eurrent flowing from the northeast should pour over the Lau- 
a seit ow exceptional cases appear to belong mostly to the later period of the 
