Sixth Line. Richelieu Canal.

The Canadians are constructing a canal which will form another communication between the East and the West, that is, between the Hudson and the St. Lawrence, between New York and Quebec. The great fissure, which forms so fine a bed for the Hudson between New York and Troy, does not end here, but stretches on towards the north to the St. Lawrence, constituting the basin of Lake Champlain, which is a long and narrow cavity in the midst of the mountains, and the bed of the River Richelieu. Between Lake Champlain and the Hudson, there is only a ridge 54 feet above the level of the former, and 134 above that of the latter. The River Richelieu, which issues from the northern end of the lake and flows into the St Lawrence, is broken by rapids, and a lateral canal, 12 miles in length, and of sufficient dimensions to receive the lake-craft, will be opened here in the course of a year; the cost will be 350,000 dollars; the distance from New York to Quebec by the canals, rivers, and lakes, is 540 miles. The railroad from St. John, where the rapids of the Richelieu begin, to Laprairie, on the St. Lawrence, opposite to Montreal, a distance of 16 miles, effects for Montreal what the canal does for Quebec; it cost about 160,000 dollars, or 10,500 dollars per mile. The distance from Montreal to New York is 360 miles.