[Footnote 128: "In extreme depth Lake Erie varies from forty to forty-five fathoms, with a rocky bottom. Lakes Superior and Huron have a stiff, clayey bottom, mixed with shells. Lake Erie reported to be the only one of the series in which any current is perceptible. The fact, if it is one, is usually ascribed to its shallowness; but the vast volume of its outlet--the Niagara River--with its strong current, is a much more probable cause than the small depth of its water, which may be far more appropriately adduced as the reason why the navigation is obstructed by ice much more than either of the other great lakes. As connected with trade and navigation, this lake is the most important of all the great chain, not only because it is bordered by older settlements than any of them except Ontario, but still more because from its position it concentrates the trade of the vast West. The Kingston Herald notices a most extraordinary occurrence on Lake Erie during a late storm (1836). A channel was made by the violence of the tempest through Long Point, N. Foreland, 300 yards wide, and from 11 to 15 feet deep. It had been in contemplation to cut a canal at this very spot, the expenses of which were estimated at L12,000. The York Courier confirms this extraordinary intelligence, stating that the storm made a breach through the point near the main land, converted the peninsula into an island, and actually made a canal 400 yards wide, and eight or ten feet deep, almost at the very point where the proposed canal was to be cut, and rendered nothing else now necessary in order to secure a safe channel for the vessels, and a good harbor on both sides, than the construction of a pier on the west side, to prevent the channel being filled up with sand."--Montgomery Martin.] [Footnote 129: "The Horse-shoe Cataract on the British side is the largest of the Falls. The curvatures have been geometrically computed at 700 yards, and its altitude, taken with a plumb-line from the surface of the Table Rock, 149 feet; the American fall, narrowed by Goat Island, does not exceed 375 yards in curvilinear length (the whole irregular semicircle is nearly three quarters of a mile), its perpendicular height being 162 feet, or 13 feet higher than the top of the Great Fall, adding 57 feet for the fall. The rapids thus give only a total of 219 feet, which is less than many other falls; but their magnificence consists in the volume of the water precipitated over them, which has been computed at 2400 millions of tons per day, 102 millions per hour! A calculation made at Queenston, below the Falls, is as follows: The river is here half a mile broad; it averages 25 feet deep; current three miles an hour; in one hour it will discharge a current of water three miles long, half a mile wide, and twenty-five feet deep, containing 1,111,400,000 cubic feet, being 18,524,000 cubic feet, or 113,510,000 gallons of water each minute."--Montgomery Martin's _History of Canada_.]