Its valley supports an estimated population of over fifty millions, or over half that of the whole United States; and has an estimated maintenance capacity of from 200,000,000 [Footnote: Justin Winsor, "Mississippi Basin," p. 4.] to 350,000,000 [Footnote: A. B. Hart, "Future of the Mississippi Valley," _Harper's Magazine_, 100:419, February, 1900.] or from four to seven times its present population. It has been tilled with "luxurious carelessness." A peasant in Brittany or a forester in Normandy would be scandalized by the extravagant, profligate use of its patrimony. That it is likely to have at least the 250,000,000 by the year 2100, and with intensive cultivation will be able to support them, is allowed by estimates of reliable statisticians. Europe had 175,000,000 at the beginning of the nineteenth century and North America 5,308,000. The former has somewhat more than doubled its population in the century since; America has increased hers about twenty times, and the Mississippi Valley several thousand times. It is not unreasonable to expect the doubling of the population of that valley in another century and its quadrupling in two. Let De Tocqueville make summary of those prideful items in his description of the valley, embraced by the equator-sloping half of the continent: "It is upon the whole," he says, "the most magnificent dwelling-place prepared by God for man's abode"--a "space of 1,341,649 square miles--about six times that of France"--watered by a river "which, like a god of antiquity, dispenses both good and evil." [Footnote: "Democracy in America," 1:22, 21, 20. New York, 1898.]