The same reasoner agrees with the views which I have expressed respecting the probability of the supply to raise the level, which must be the great feeder derived from the south and south-westward invariably rainy winds, when of long continuance, in the basin of the St. Lawrence, and generated by the gulf stream in its gyration through the Mexican Bay, being heaped up from the trade wind which causes the oceanic current, and forces its heated atmosphere north and north-east, by the rebound which it takes from the vast Cordilleras of Anahuac and Panama; thus depositing its cooling showers on the chain of the fresh water seas of Canada, condensed as they are by the natural air-currents from the icy regions of the western Andes of Oregon, and the cold breezes from the still more gelid countries of the north-west. The American topographical engineers, as well as our own civil engineers and savans, have accurately measured the heights and levels of the lakes, which I have already given; but one very curious fact remains to be noticed, and will prove that it is by no means a visionary idea that, from the great island of Cuba, which must be an English outpost, if much further annexation occurs, voyages will be made to bring the produce of the West Indies and Spanish America into the heart of the United States and Canada by the Mississippi and the rivers flowing into it, and by the great lakes; so that a vessel, loading at Cuba, might perform a circuit inland for many thousand miles, and return to her port _via_ Quebec. From the Gulf of Mexico to the lowest summits of the ridge separating the basin of the Mississippi from that of the St. Lawrence or great lakes, the rise does not exceed six hundred feet, and the graduation of the land has an average of not more than six inches to a mile in an almost continuous inclined plane of six thousand miles. The Americans have not lost sight of this natural assistance to form a communication between the lakes and the Mississippi.