Lake Ontario is the most easterly of the four large lakes through which the boundary line passes, that separates the United States from the province of Upper Canada. It is two hundred and twenty miles in length, from east to west, and seventy miles wide in the broadest part, and, according to calculation, contains about 2,390,000 acres. This lake is less subject to storms than any of the others, and its waters in general, considering their great expanse, are wonderfully tranquil. During the first evening of our voyage there was not the least curl even on their surface, they were merely agitated by a gentle swell; and during the subsequent part of the voyage, the waves were at no time so high as to occasion the slightest sickness amongst any of the passengers. The depth of the water in the lake is very great; in some parts it is unfathomable. On looking over the side of a vessel, the water, owing to its great depth, appears to be of a blackish colour, but it is nevertheless very clear, and any white substance thrown overboard may be discerned at the depth of several fathoms from the surface; it is, however, by no means so clear and transparent as the water of some of the other lakes. Mr. Carver, speaking of Lake Superior, says, “When it was calm, and the sun shone bright, I could sit in my canoe, where the depth was upwards of six fathoms, and plainly see huge piles of stone at the bottom, of different shapes, some of which appeared as if they had been hewn; the water was at this time as pure and transparent as air, and my canoe seemed as if it hung suspended in that element. It was impossible to look attentively through this limpid medium, at the rocks below, without finding, before many minutes were elapsed, your head swim, and your eyes no longer able to behold the dazzling scene.” The water of Lake Ontario is very well tasted, and is that which is constantly used on board the vessels that traverse it. [Sidenote: RISING OF THE WATER.]