1881.] ^^ ' [Spencer. 



water). This, with a thickness of eight or ten feet gets piled up by the 

 action of waves and wind, and consequently in the bays of the coast of 

 Labrador it polishes rock bottoms to a depth of fifteen feet or more, below 

 the surface of the water, and grinds off rough surfaces. I have frequently 

 seen, myself, in northern regions, high boulders transported by the ice to 

 which they were frozen in the margin of small lakes. 



From what has been written, it seems to the writer that the glacial origin 

 of Lake Ontario does not rest on a single basis further than that ice scratch- 

 ings (producible by either glaciers or icebergs, neither of which need be 

 great erosive agents) are seen at various places about Lake Ontario, both 

 above and below the water-level. The remarks applied to Lake Ontario 

 hold good for the other lakes. The description of their topography 

 strengthens the proofs that their origin cannot be accounted for by glaciers, 

 because we find the islands at the western end of Lake Erie, or northern 

 end of Lake Huron, polished and striated. 



Before closing, permit me to thank those railway companies which have 

 kindly furnished me with many levels. But in doing this, I may state that 

 it is my purpose to make further requests and hope to do for Ontario, what 

 the Pennsylvania Survey has done, in collecting all levels that bear on the 

 topography of my native Province, in order to make a more complete study 

 of the Preglacial drainage of the great lake region. 



