An official report, compiled by the Chief Engineer of the St. Mary’s Falls Canal (United States), contains a detailed statement of the commerce of that canal for each year, from 1855 to 1895, and goes far to substantiate what has already been said as to the magnitude of the lakes’ commerce. The number of vessels that passed through in 1895 was 17,956, with a registered tonnage of 16,806,781 tons. The number of sailing vessels was 4,790; of steamers, 12,495; and of unregistered craft, 671. The number of passengers conveyed from lake to lake was 31,656. As to the cargoes of the vessels, these are a few of the chief items: 2,574,362 net tons of coal; 8,902,302 barrels of flour; 46,218,250 bushels of wheat; 8,328,694 bushels of other grain; 107,452 tons of copper; 8,062,209 tons of iron ore; 740,700,000 feet of sawed lumber; 100,337 tons of manufactured and pig iron; 269,919 barrels of salt—in all, 15,062,580 net tons of freight. The freight traffic of the St. Mary’s Canal, in seven months of 1895, was more than twice that of the Suez Canal, which is open all the year. During the year 1897 it was much greater than in any previous year, the registered tonnage being 17,619,933, the tons of freight 18,218,411, and the number of passengers 40,213. [Illustration: ST. MARY’S FALLS SHIP CANAL OF 1881, STATE OF MICHIGAN, U. S. A.] The gradual development of steam navigation on Lake Superior is shown in a table of parallel columns, extending over thirty years. In 1864 the sailing vessels that used the canal were three times as numerous as the steamers; but in 1895 the steamers were three times as numerous as the sailing vessels, and they had increased enormously in tonnage. The number of sailing vessels built on the Great Lakes in 1896 was nineteen; in that year there were built _seventy-five_ steamers, aggregating 75,743 tons register, and of these thirty-five were built of steel, with a combined tonnage of 63,589 tons. The principal ship-building yards on the Upper Lakes are at Buffalo, Cleveland, Detroit, Bay City, Milwaukee, Chicago and Superior. At most of these points there are plants for the construction of iron and steel vessels. It is said that Cleveland is the largest ship-building port, and also the largest iron ore market in the United States.