From surveys actually made by Lieut. Freemont, it is certain, that a rail-road from Cumberland, in Maryland, to the Pacific, is entirely within our means as a nation, at an expense of only about fifty millions of dollars or less; and it is equally certain that the new lands to be brought into market by making the road, would defray every dollar of the expense of making it. We live in the infancy of the greatest nation that now exists, ever did, or ever will exist, on the face of the globe. Looking through the vista of futurity, we can now behold a nation consisting of five hundred millions of people, all speaking our language, and governing the world in peace without a rival in commerce, arts or arms. Should the British lion growl at us, the Gallic cock would flap his wings and crow at our success, and the Russian bear smile upon us. The American eagle will yet soar above both, into his own pure air, where he can revel in the brilliant beams of his own flaming sun. The trade between the East Indies and Europe will eventually pass across our territory, east and west, and the time of passing from London to Canton might not occupy more than two months. Such a state of things would add to the wealth, numbers, commerce, agriculture and manufactures of this whole nation. Such a nation, whose territory extended from the Atlantic to the Pacific, from the Icy sea in the north to the Isthmus of Darien in the south, would present a sublime spectacle. What a vast field in which free government might exercise its energies! The human imagination is lost in its contemplation of such a prospect, for the future generations of our posterity.