Note 141 — Chapter IV

"The St. Lawrence traverses the whole extent of Lower Canada, as the lakes every where border and inclose Upper Canada. There is a difficulty in tracing its origin, or, at least, which of the tributaries of Lake Superior is to be called the St. Lawrence. The strongest claim seems to be made by the series of channels which connect all the great upper lakes, though, strictly speaking, till after the Ontario, there is nothing which can very properly be called a river. There are only a number of short canals connecting the different lakes, or, rather, separating one immense lake into a number of great branches. It seems an interesting question how this northern center of the continent, at the precise latitude of about 50°, should pour forth so immense and overwhelming a mass of waters; for through a great part of its extent it is quite a dead flat, though the Winnepeg, indeed, draws some tributaries from the Rocky Mountains. The thick forests with which the surface is covered, the slender evaporation which takes place during the long continuance of cold, and, at the same time, the thorough melting of the snows by the strong summer heat, seem to be the chief sources of this profuse and superabundant moisture."—H. Murray's Historical Account of Discoveries and Travels in North America, vol. ii., p. 459, 1829.