Besides these, there are numerous other bottoms on the Mississippi, within the limits prescribed for this report, all of which are composed of a rich alluvion. Those in particular situated below the confluence of the Mississippi and Missouri are possessed of a soil exceedingly luxuriant, being composed, as before observed, of the rich and fertilizing mud deposited from the water of the Missouri. Most of them are covered with deep and heavy forests of timber, accompanied with a luxuriant undergrowth of vines, shrubs, grass and other herbage.
The bottoms of the Wabash, Kaskaskias, Illinois, and Rock rivers, are also made up of a rich alluvion of sand and loam, containing a large proportion of vegetable mould. Their surfaces, like those of the Mississippi bottoms, are generally flat, exhibiting tabular elevations or benches, formed by the washing of their rivers at different periods. Large tracts of prairie land are to be met with upon them; but for the most part the proportion of woodland is amply sufficient to supply the adjacent country with timber and fuel.
The valleys of these rivers differ from that of the Ohio, not only in having a greater width, but also in being limited on both sides by bluffs stretching along their whole length, and maintaining nearly a parallel direction; whereas the valley of the Ohio is bounded by abrupt hills irregularly disposed, in some instances protruding far into the valley like promontories, and in others retiring from the river, and affording room for bottoms of pretty large extent. The Ohio bottoms are uniformly clad in deep forests, except where they have been removed by settlers; no prairies worthy of notice making their appearance.
{208} The valley country, from the circumstances already detailed in allusion to the country constituting the second variety, is almost without exception unhealthy. But at the same time it appears evident, that this evil gradually decreases in proportion to the increase of population, and the consequent advancement of agriculture; for the products of the soil, which the bottoms yield in the greatest profusion, instead of being left to wither and decay upon the surface, are necessarily consumed in the subsistence of man and beast; in consequence of which, one of the most fruitful causes of pestilential effluvia, viz. vegetable putrefaction, is in a very considerable degree removed.
The prevailing timber growth of the region comprehending the two sections of country already described, is exhibited in the following list of trees: viz. cotton-wood, willow, sycamore, black walnut, pecan, coffee-tree, sweet and sour or black gum, red and water elm, hackberry, blue and white ash, linden, yellow and white poplar, catalpa, black and honey locust, buck-eye, bur oak, white and black oak, mulberry, box, elder, white dogwood, sugar-tree, white maple, wild cherry, red oak, hickory, iron-wood, and hop hornbeam. The foregoing constitute the principal timber growth of the valley country, and are to be met with more or less frequently throughout the whole of it. Red beech is abundant in some parts of the valley of the Ohio, and in those of many of its tributaries; it abounds also in the northerly parts of the States of Ohio and Indiana. Post oak, black jack, and several other varieties of the oak, also chesnut, white and shell bark, hickory, persimmon, &c. are sometimes found in the bottoms, but are more prevalent upon the hills and highlands. Pitch pine abounds in many parts of Ohio and Indiana, and generally in the neighbourhood of the Alleghany mountains. White pine occasionally {209} makes its appearance in the northerly parts of Ohio. Red cedar is found in a great variety of places throughout the country, but no where in great abundance.
The undergrowth of the several tracts of country above considered includes a great variety of shrubs, vines, brambles, grass and other herbage, to be enumerated in a botanical catalogue daily expected from Dr. James.
The most valuable timber trees are the white, post, and bur oaks, the white and blue ash, the shell bark hickory, the black walnut, the cherry, the locust, chesnut, poplar, mulberry, beach, cotton-wood and linden. The two last mentioned are seldom used where other kinds of timber are to be had. The cotton-wood is not only the most abundant timber-growth upon the bottoms, but is more widely diffused than any other, and in many places is the only variety of forest trees that make their appearance; which, however, is more particularly the case westward of the Mississippi.
Of the country situated between the Mississippi and Missouri rivers
We next proceed to a consideration of the country west of the Mississippi, and shall begin with that situated between this river and the Missouri. This section contains no mountains, or indeed hills, of any considerable magnitude. The term rolling appears to be peculiarly applicable in conveying an idea of the surface of this region, although it is not entirely destitute of abrupt hills and precipices. The aspect of the whole is variegated with the broad valleys of rivers and creeks, and intervening tracts of undulating upland, united to the valleys by gentle slopes. Its surface is chequered with stripes of woodland situated upon the margins of the watercourses, and dividing the whole into extensive parterres. If we {210} except those parts of the section that are contiguous to the Mississippi and Missouri, at least nineteen-twentieths of the country are completely destitute of a timber-growth.