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of wild land as a demand for men. The desert of Sahara makes no demand for men; but nature is fully as well satisfied to make a Sahara, where such is the product of her operations, as to make the wheat fields of Iowa or Dakota. Even in Iowa and Dakota, nature offers men no wages for labor. There are the land, the sunshine, and the rain. If the men know how to use those elements to get wheat there, and if they will work hard enough for it, they can get it and enjoy it; if not, they can lie down and die there on the fertile prairie, as many a man did before the industrial organization had expanded widely enough to embrace those districts. Nature went on her way without a throb of emotion or a deviation by a hair's breadth from the sequence of her processes.

It is by no means in the sense of any such rhetorical flourish or aberration that I say that the widest and most controlling condition of our status on earth is the ratio of our numbers to the land at our disposal. This ratio is changing all the time on account of changes which come about either in the numbers of the men or in the amount of the land. The amount of the land, again, is not a simple arithmetical quantity. As we make improvements in the arts a single acre is multiplied by a new factor and is able to support more people. All the improvements in the arts, of whatever kind they are, have this effect, and it is by means of it that, other things remaining the same, they open wider chances for the successive generations of mankind to attain to comfort and well-being on earth. All our sciences tell on the same ratio in the same way. Their effect is that by widening our knowledge of the earth on which we live, they increase our power to interpose in the play of the forces of nature and to modify it to suit our purposes and preferences. All the developments of our social organization have the same effect.