244 



THE CLIMATIC FACTOR AS ILLUSTRATED IN ARID AMERICA. 



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+ 5. 



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'yCr- 



r-E3 







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Wi ■■' 'fin '' '■■ U.i?>k-;>>--t':<"-^; 



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I'Ui. 77.— 'I'he Corn Crop of the United States, 1901, a "Lean" Year, after ;\rcto\vski. 



Fig. 78.— The Corn Crop of the United States, 190G, a "Fat" Year, after Arctowslci. 



