The fine estuary which penetrates the American coast, between the fortieth and forty-first degrees of latitude, is formed by the confluence of the Hudson, the Hackensack, the Passaic, the Raritan, and a multitude of smaller streams; all of which pour their tribute into the ocean, within the space named. The islands of Nassau and Staten are happily placed to exclude the tempests of the open sea, while the deep and broad arms of the latter offer every desirable facility for foreign trade and internal intercourse. To this fortunate disposition of land and water, with a temperate climate, a central position, and an immense interior, that is now penetrated, in every direction, either by artificial or by natural streams, the city of New-York is indebted for its extraordinary prosperity. Though not wanting in beauty, there are many bays that surpass this in the charms of scenery; but it may be questioned if the world possesses another site that unites so many natural advantages for the growth and support of a widely extended commerce. As if never wearied with her kindness, Nature has placed the island of Manhattan at the precise point that is most desirable for the position of a town. Millions might inhabit the spot, and yet a ship should load near every door; and while the surface of the land just possesses the inequalities that are required for health and cleanliness, its bosom is filled with the material most needed in construction.The consequences of so unusual a concurrence of favorable circumstances, are well known. A vigorous, healthful, and continued growth, that has no parallel even in the history of this extraordinary and fortunate country, has already raised the insignificant provincial town of the last century to the level of the second-rate cities of the other hemisphere. The New-Amsterdam of this continent already rivals its parent of the other; and, so far as human powers may pretend to predict, a few fleeting years will place her on a level with the proudest capitals of Europe.It would seem that, as Nature has given its periods to the stages of animal life, it has also set limits to all moral and political ascendency. While the city of the Medici is receding from its crumbling walls, like the human form shrinking into "the lean and slipper'd pantaloon," the Queen of the Adriatic sleeping on her muddy isles, and Rome itself is only to be traced by fallen temples and buried columns, the youthful vigor of America is fast covering the wilds of the West with the happiest fruits of human industry.