These lakes and ponds could be drained at a small expense, and the soil would be susceptible of cultivation. The early settlements of the Americans were either on this bottom, or the contiguous bluffs.
Besides the American bottom, there are others that resemble it in its general character, but not in extent. In Union county, there is an extensive bottom on the borders of the Mississippi. Above the mouth of the Illinois, and along the borders of the counties of Calhoun, Pike, and Adams, there are a series of bottoms, with much good and elevated land; but the inundated grounds around, present objections to a dense population at present.
The bottoms of Illinois, where not inundated, are equal in fertility, and the soil is less adhesive than most parts of the American bottom. This is likewise the character of the bottoms in the northern parts of the State.
The bottoms of the Kaskaskia are generally covered with a heavy growth of timber, and in many places inundated when the river is at its highest floods.
The extensive prairies adjoining, will create a demand for all this timber. The bottom lands on the Wabash are of various qualities. Near the mouth, much of it is inundated. Higher up it overflows in high freshets.
These bottoms, especially the American are the best regions in the United States for raising stock, particularly horses, cattle, and swine. Seventy-five bushels of corn to the acre is an ordinary crop. The roots and worms of the soil, the acorns and other fruits from the trees, and the fish of the lakes, accelerate the growth of swine. Horses and cattle find exhaustless supplies of grass in the prairies; and pea vines, buffalo grass, wild oats, and other herbage in the timber, for summer range; and often throughout most of the winter. In all the rush bottoms, they fatten during the severe weather on rushes. The bottom soil is not so well adapted to the production of small grain, as of maize or Indian corn, on account of its rank growth, and being more subject to blast, or fall down before harvest, than on the uplands.
3. Prairies. Much the largest proportion is undulating, dry, and extremely fertile. Other portions are level, and the soil in some cases proves to be wet;—the water, not running off freely, is left to be absorbed by the soil, or evaporated by the sun. Crawfish throw up their hillocks in this soil, and the farmer who cultivates it, will find his labors impeded by the water.
In the southern part, that is, south of the National road leading from Terre Haute to the Mississippi, the prairies are comparatively small, varying in size from those of several miles in width, to those which contain only a few acres. As we go northward, they widen and extend on the more elevated ground between the water courses to a vast distance, and are frequently from six to twelve miles in width. Their borders are by no means uniform. Long points of timber project into the prairies, and line the banks of the streams, and points of prairie project into the timber between these streams. In many instances are copses and groves of timber, from one hundred to two thousand acres, in the midst of prairies, like islands in the ocean. This is a common feature in the country between the Sangamon river and lake Michigan, and in the northern parts of the State. The lead mine region, both in this State and the Wisconsin territory, abounds with these groves.
The origin of these prairies has caused much speculation. We might as well dispute about the origin of forests, upon the assumption that the natural covering of the earth was grass. Probably one half of the earth's surface, in a state of nature, was prairies or barrens. Much of it, like our western prairies, was covered with a luxuriant coat of grass and herbage. The steppes of Tartary, the pampas of South America, the savannas of the Southern, and the prairies of the Western States, designate similar tracts of country. Mesopotamia, Syria, and Judea had their ancient prairies, on which the patriarchs fed their flocks. Missionaries in Burmah, and travellers in the interior of Africa, mention the same description of country. Where the tough sward of the prairie is once formed, timber will not take root. Destroy this by the plough, or by any other method, and it is soon converted into forest land. There are large tracts of country in the older settlements, where, thirty or forty years since, the farmers mowed their hay, that are now covered with a forest of young timber of rapid growth.
The fire annually sweeps over the prairies, destroying the grass and herbage, blackening the surface, and leaving a deposit of ashes to enrich the soil.