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246 to give over an acre to the cultivation of this crop and she should prohibit the growing of tobacco as she has that of the poppy. Let her take the wise step now when she readily may, for all civilized nations will ultimately be compelled to adopt such a measure. The United States in 1902 had more than a million acres growing tobacco, and harvested 821,000,000 pounds of leaf. This leaf depleted those soils to the extent of more than twenty-eight million pounds of nitrogen, twenty-nine million pounds of potassium and nearly two and a half million pounds of phosphorus, all so irrecoverably lost that even China, with her remarkable skill in saving and her infinite patience with little things, could not recover them for her soils. On a like area of field might as readily be grown twenty million bushels of wheat and if the twelve hundred million pounds of grain were all exported it would deplete the soil less than the tobacco crop in everything but phosphorus, and in this about the same. Used at

Fig. 134.—Home after the day's work, in Japan.