This vast territory, however, forms a single valley, one side of which descends gradually from the rounded summits of the Alleghanies, while the other rises in an uninterrupted course towards the tops of the Rocky Mountains.

At the bottom of the valley flows an immense river, into which the various streams issuing from the mountains fall from all parts.

In memory of their native land, the French formerly called this river the St.Louis.The Indians, in their pompous language, have named it the Father of Waters, or the Mississippi.
[Footnote a: Darby's "View of the United States."] The Mississippi takes its source above the limit of the two great regions of which I have spoken, not far from the highest point of the table-land where they unite.

Near the same spot rises another river, *b which empties itself into the Polar seas.

The course of the Mississippi is at first dubious: it winds several times towards the north, from whence it rose; and at length, after having been delayed in lakes and marshes, it flows slowly onwards to the south.