These figures show correctly the tonnage arriving at and departing from tide-water on the Hudson by canal, and that passing up and down the St. Lawrence canals, during the past year. Upon the Mississippi routes the estimates are based upon the best data obtainable. There are no means at hand of estimating with any probable degree of accuracy the "up" tonnage of the Mississippi. With these additions, the following table would show the comparative movement upon the dif ferent routes: Comparative statement showing tonnage and value of merchandise sent from and received at seaboard by way of the New York canals and St. Lawrence and Mississippi rivers for 1851. The movement on the Pennsylvania line is not entered in the comparative statement, because only the through-tonnage, which is supposed to be represented by the amount transported over the Portage railroad, is shown. The amount of this tonnage going east upon this road for 1851 was 13,696 tons, valued at $125,000; total tonnage going west, 10,961 tons, valued at $2,779,731. The tonnage of the public works of Pennsylvania having an eastern direction is derived chiefly from the produce of the State, which is of great magnitude and importance. For this trade there are two outlets-one by the Columbia railroad, and one by the Tide-water canal, the returns of the tonnage of which will be found annexed. 58 Tabular statement showing the value of property received at seaboard by the foregoing routes. The movements for the past year upon the St. Lawrence and Portage routes only are given, for the want of convenient data. The downward tonnage upon the St. Lawrence canals for 1850 was 212,135, against 329,621 for 1851, upon which the above estimate is made. The tonnage is estimated to correspond in value with the estimated value of similar articles on the Erie canal. Statement of property sent westward from Philadelphia by railroad in |