The system of navigable water ways from Duluth and Port Arthur on Lake Superior to the Strait of Belle Isle is twenty-two hundred miles long. At Lake Ontario the head of the St. Lawrence River is two hundred and thirty-one feet above the sea level, and its current descends that distance to tidewater chiefly by going down successive rapids. There are ship canals around these rapids and around Niagara Falls, and also connecting various lakes above. The Sault Sainte Marie locks and canals, at the outlet of Lake Superior, have already been described. The admirable systems conducting navigation around the rapids in the river below Lake Ontario also carry a large tonnage. Between Ogdensburg and Montreal, a distance of about one hundred and twenty miles, the navigation of forty-three miles is through six canals of various lengths around the rapids, each having elaborate locks. The Gulf of St. Lawrence is also constructed upon an enormous scale, covering eighty thousand square miles, and with the lower river having a tidal ebb and flow of eighteen to twenty-four feet. The mouth of the river and head of the Gulf are usually located at Cape Chatte, far below the Saguenay, and from the Cape almost up to Quebec the river is ten to thirty miles wide. In front of Quebec it narrows to less than a mile, while above, the width is from one to two and a half miles to Montreal, expanding to ten miles at Lake St. Peter, where the tidal influence ceases. Above Montreal the river occasionally expands into lakes, but is generally a broad and strongly flowing stream with frequent rapids. The largest ocean vessels freely ascend to Montreal, at the head of ship navigation, Lachine rapids being just above the city. For several months in winter, however, ice prevents. THE CITY OF TORONTO.