In the spring of 1845, the fleet on Lake Superior consisted of the schooner White Fish, belonging to the Hudson's Bay Company, the Siscowit, belonging to the American Fur Company, and the Algonquin, owned by a Mr. Mendenhall. The same year the schooners Napoleon, Swallow, Uncle Tom, Merchant, Chippewa, Ocean, and Fur Trader, were all added. In 1845, the propeller Independence, the first steamer that ever floated on Lake Superior, was taken across the portage, and the next year the Julia Palmer followed her, she being the first side-wheel steamer. In the winter of 1848-9, the schooner Napoleon was converted into a propeller. In 1850, the propeller Manhattan was hauled over by the Messrs. Turner, and the Monticello in 1851, by Col. McKnight. The latter was lost the same fall, and Col. McK. supplied her place the next winter with the Baltimore. In 1853 or 1854, E. B. Ward took over the Sam Ward, and Col. McKnight took the propeller Peninsula over in the winter of 1852 or 1853. In the spring of 1855, the Saut Canal was completed, since which date the trade with that important region has rapidly grown into commanding importance. It will be seen by the table below that the importations of machinery, provisions, supplies, and merchandise, for the past year amounted to $5,298,640, while the exports of copper, iron, fur and fish amount to $3,071,069. The following are the names of the steam craft now regularly employed in this trade: S. B. Illinois. Prop. Mineral Rock. S. B. Lady Elgin. Prop. Montgomery. S. B. North Star. Prop. Northern Light. Prop. Marquette. Prop. Iron City. A number of other steam-craft made occasional trips last year, and next season it is expected that another line will be placed on the route permanently. The Detroit shipping-office has published the names of ninety-six sail vessels that have been engaged in the iron trade the past year. Rapid as this trade has increased, it is destined, no doubt, to yet undergo a still greater transformation. The latent resources of the Upper Peninsula are of a character and magnitude that defy all estimates of their future greatness. With regard to the importance of the trade to our city, and the steps to be taken to retain it, ample comments have already appeared in the _Tribune_, both editorially and in the form of communications, to which we can add nothing. The aggregate amount of tolls collected in May, July, August and September, was $10,374.18, a large increase over the corresponding months last year. Including the probable amount for the months not reported, and we have at the lowest not less probably than $16,000, as the tolls for 1859. Number of passengers: May, 2,493; June, 1,764; July, 2,116; August, 2,617; September, 1,538; October, 1,015.