[Footnote 149: "The Falls of the Rideau are about fifty feet in height and 300 in breadth, being, at the time we saw them, more magnificent than usual, by reason of the high state of the waters. It is from their resemblance to a curtain that they are distinguished by the name of Rideau, and they also give this name to the river that feeds them, which again lends the same appellation to the canal that connects the Ottawa with Lake Ontario."--Simpson, vol. i., p. 16.] [Footnote 150: Modern alluvial accumulations are rapidly increasing on some points of this coast, owing to the enormous mass of fresh water, charged with earthy matter, that here mingles with the sea. The surface of the water at the mouth of the St. Lawrence, where the depth is 100 fathoms, is stated by Bayfield to be turbid from this cause: yet that this discoloration is superficial is evident, for in the wake of a ship moving through the turbid surface, the clear blue waters of the sea are seen below.] CHAPTER V. Upon the surface of Canada are found manifest indications of that tremendous deluge, the effects of which are so plainly visible in the Old World. Huge bowlder stones[151] abound in almost every part of the province; sometimes they are seen rounded, piled in high heaps on extensive horizontal beds of limestone, swept together by the force of some vast flood. Masses of various kinds of shells lie in great quantities in hollows and valleys, some of them hundreds of feet above the level of Lake Ontario. Near to great rivers, and often where now no waters are at hand, undulations of rocks are seen like those found in the beds of rapids where the channels are waved. These have evidently, at some remote period, been the courses of floods now no longer existing. On the shores of the Gulf of St. Lawrence detached bowlder stones appear, some of enormous size, many tons in weight; they must have come from a great distance, for nowhere in that region is there any rock of similar material. In the upper strata of the country are abundant fossil remains of distinct animal existences now unknown; they are blended with the limestone in which they lie. It seems certain that the whole of Canada has been violently convulsed by some effort of nature since the floods of the deluge passed away; the mountains are abrupt and irregular in outline, and in some places cleft with immense chasms; the rivers also show singular contortions. North of Quebec and in St. Paul's Bay are many traces of volcanic eruptions, and vast masses of alluvial rocks, bearing marks of vitrification, frequently appear on the surface of the earth. There is, besides, strong evidence that the American Continent has lain for unknown ages beneath the great deep, or that it is of later formation than Europe or Asia.