Within the valleys of these two rivers are extensive tracts of alluvial bottom possessed of a rich soil. The bottoms of the Missouri in particular are probably inferior to none within the limits of the United States in point of fertility. Those of the Mississippi are very rich, but do not exhibit symptoms of so great fecundity as the former. The bottoms of both, on ascending the rivers, become more sandy, and apparently less productive.

The bottoms of the Missouri are for the most part clad in a deep and heavy growth of timber and under-brush, to the distance of about three hundred and fifty miles above its mouth. There are, however, prairies of considerable extent occasionally to be met with on this part of the river. Higher up, the prairies within the river valley become more numerous and extensive, till at length no woodlands appear, except tracts of small size, situated at the points formed by the meanders of the river.

The bottoms on the Upper Mississippi (that part of the Mississippi situated above its confluence with the Missouri being distinguished by this appellation) contain less woodland, in proportion to their extent, than those of the Missouri. The prairies upon this river also become more numerous and extensive as we proceed upward.

The interior of the country, situated between the valleys of these rivers, presents, as before remarked, a rolling aspect, inclining to hilly, and broken in some parts, but generally variegated with gentle swells and broad valleys. Within this section are numerous small rivers and creeks, with valleys of a character similar to those of the Mississippi or Missouri, but not so fertile. These valleys expand to a great width, compared with the magnitude of the streams upon which they are situated, {211} but are not bounded by abrupt bluffs, like those of the two rivers just mentioned. They are generally covered with a luxuriant growth of grass and other herbage, and occasionally present copses of woodland of moderate extent. The timber-growth of the bottoms is similar to that of the Mississippi bottoms; cotton-wood, blue and white ash, hackberry, black walnut, cherry, mulberry, hickory, and several varieties of the oak, being the prevailing timber trees. The hills or high lands are in some instances covered with a scrubby growth of timber and furze, consisting of post oak, black jack, hazel, green brier, &c. The soil of this section is probably equal, if not superior, to that of any other tract of upland of equal extent within our territory. But the scarcity of timber, mill-seats, and springs of water,—defects that are almost uniformly prevalent,—must for a long time prove serious impediments in the way of settling the country.

The population of this section of country is located almost exclusively within the valleys of the Mississippi and Missouri, and in their immediate neighbourhood, extending upwards along the former about one hundred and sixty, and along the latter about three hundred and twenty miles above their confluence. The most populous parts of the country are the county of St. Charles, situated near the junction of these two rivers; Cote Sans Dessein and its vicinity; that part usually denominated the Boon's Lick country, extending from the mouth of Osage river upward along the Miami to the river Chariton; and the country on the Mississippi, including the Salt river settlements, which have become numerous and pretty widely diffused.

Along the valleys, both of the Mississippi and Missouri, there are still innumerable vacancies for settlement, holding forth inducements for emigrants to occupy them, equally as strong as any of the positions already occupied. The inhabitants of this {212} section have frequently been visited by the prevailing epidemics of the western country, which may be attributed, in all probability, to the same causes that have been herein assigned in relation to the country east of the Mississippi, which operate with equal force and effect upon the inhabitants of this section.

Of the country situated between the Missouri and Red rivers, west of the Mississippi and east of the meridian of the Council Bluff.

Although no precise limits can be assigned as the western boundary of this section, yet the meridian above proposed may be regarded as a line of division between two regions differing in their general character and aspect. It is not pretended that the immediate course of the line is marked by any distinct features of the country, but that a gradual change is observable in the general aspect of the two regions, which takes place in the vicinity of the proposed line. The assumed meridian is in longitude ninety-six degrees west nearly, and crosses the Platte a few miles above its mouth, the Konzas near the junction of the principal forks, the Arkansa about one hundred miles above the Verdigrise, or seven hundred miles from its mouth, the Canadian about one hundred and fifty miles from its mouth, and the Red river about one hundred and fifty miles above the Kiamesha river.

The section of country under consideration exhibits a great variety of aspect, the surface being diversified by mountains, hills, valleys, and occasional tracts of rolling country; within the section, is an extensive tract of bottom land deserving of a particular consideration. It is situated on the Mississippi, commencing a few miles below the Ohio, and extending downward to Red river, uninterrupted by hills or high lands, and subject in many places to inundation from the freshets of the Mississippi. The bottoms contain many large swamps, rendered almost {213} impenetrable by a dense growth of cypress and cypress-knees (the latter of which are conical excrescences springing from the roots of the cypress, and shooting up in profusion to the height of from one to eight or ten feet). The most extensive of these swamps commences near the head of the bottom, and passes south-westwardly back of New Madrid, the Little Prairie, St. Francisville, &c., and terminates near the village of the Port of Arkansa. The Great Swamp, the name by which this extensive morass is designated, is about two hundred miles in length, and is of a variable width, from five to twenty or thirty miles. The timber-growth of this and of the other swamps, which are of a similar character, but inferior in magnitude, consist principally of cypress of a superior quality. But the difficulty of removing it renders it of little value to the country. Within the bottom are also numerous lakes, lagoons, and marshes, once, no doubt, parts of the bed of the Mississippi, or of some of its tributaries that have their courses through the bottom. Notwithstanding the general depression of this bottom, it contains many insulated tracts of considerable extent, elevated above the range of the highest floods. The bottom, almost throughout its whole extent, supports a dense and heavy growth of timber, of an excellent quality, together with a luxuriant undergrowth of cane brake, vines, &c.