feet in width, and from four to ten in depth, was $28,387 per mile. Assuming $28,000 per mile as the average cost of the canals requiring enlargement, and $83,000 that of those per mile having already the requisite dimensions, the difference would be $55,000 per mile, as the average cost of those needing increased dimensions. The estimated cost, then, would stand as follows: 598 miles New York canals, enlargement of locks $5,980,000 Enlarging dimensions, etc., of 1,696 miles, at $55,000 per mile 93,280,000 ----------- Total, $99,260,000 The conjectural estimate heretofore made by me was $133,528,556, or one tenth the cost of our existing railroads and canals, and exceeding, by $1,528,556, the cost of all our present 4,650 miles of canal. Deduct this from the above $133,528,556, leaves $34,268,556, to be applied to improving the St. Clair flats, the Mississippi river, deepening its mouth, and for the ship canal round the Falls of Niagara. No estimate is now presented of the cost of the canal from Lake Champlain to the St. Lawrence, because that requires the cooeperation of Canada. The railroads of our country would increase their business, with our augmented wealth and population, especially in the transportation of passengers and merchandise. They would also obtain iron cheaper for rails, boilers, and engines, timber for cars, breadstuffs and provisions for supplies, and coal or wood for their locomotives.