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._