Under the appropriate head will be found a complete and authentic statement of the commerce of the Saut St. Mary Canal, by which it will be seen that the aggregate value of the upward-bound freight is estimated at $5,298,640. The up-freight nearly all carried by steamers, of which the number running the entire season was seven, three from Detroit, one from Chicago, and three from Cleveland. The Detroit boats have generally been loaded to their utmost capacity, while we have the word of the Cleveland captains to the effect that two-thirds of their cargoes are usually taken on at this port. We must therefore be clearly within bounds in claiming that three-fourths of the above amount is part and parcel of the commerce of our city which would show our Lake Superior exports to be $3,960,000. In seasons in which the crops of our Canadian neighbors partially fail--a common occurrence within the past few years, but which we hope may never occur again--they naturally become our customers; and since the partial destruction of the wheat crop in Ohio last summer by frost, there have been considerable shipments of breadstuffs to Cleveland, Toledo, Sandusky, etc., which may very properly be included in the home traffic. The shipments of flour and grain for the supply of our home trade by lake craft, from the opening of navigation for the year 1859, as appears by the books of our Custom House, are as follows: Flour. Wheat. Corn. Port Huron 10,885 253 6,916 Saginaw 3,790 30 Cleveland 6,155 28,057 1,146 Thunder Bay 106 Green Bay 175 Northport 175 Sandusky 705 Huron, O. 660 Toledo 665 616 Lake Superior 11,321 Other American ports 245 Malden 1,289 160 14,548 Chatham 3,671 1,736 Wallaceburg 705 Goderich 318 1,274 Saugeen 168 Bayfield 200 Other Canadian ports 1,330 95 749 There were also 7,446 bushels oats to Port Huron, and 588 bushels do. to other ports, beside 3,400 bushels corn, and 11,962 bushels oats which were included in the heavy shipments to Lake Superior. We give the places for which vessels cleared; many of the shipments were for intermediate ports. Besides the flour and grain there were large shipments of pork, butter, lard, meal, etc., etc. The above were all by water. There were in addition large local shipments to various points on the Great Western, the Detroit and Milwaukee, and other roads, that may with equal propriety be regarded as pertaining to the home trade.