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Living on the Air 267 America, Argentina, Australia, and Russia, owing to the enormous aggregate of grain these respective countries produce year by year, that we consider such terri- tories to be literally flowing with milk and honey, where fortunes may be built up within a few years, and to overlook the possibilities in the self-same direction which prevail in the old countries of Europe. Here, owing to the density of the population, and the fact that there is virtually little or no virgin land to be taken over for wheat culture, the aggregate wheat yields per country appear to be insignificant in comparison. But it is not in the bulk that one must review the problem ; it is the yield of wheat per acre which offers the true index to the wheat-raising capacity of the old countries. For instance, in the United Kingdom we raise nearly twice as much per acre as is achieved in Canada, and nearly two and a half times that produced in the United States. The results achieved in Denmark are even more astonishing, the Danish farmers being able to obtain about 5°Per cent, more from each acre of ground than is derived in Great Britain. How is this result achieved ? If Denmark can raise some 40 bushels of wheat per acre, why cannot they do the same thing in the new wheat-bearing territories of the world ? The answer is that the farmers of the Old World, from sheer force of cir- cumstances, are compelled to exploit their land scientifically, and to rely more and more upon the fruits of laboratory investigation and experiment. The land has been zealously tilled for centuries; the natural nitrogenous wealth which it once possessed