658 BIBLIOGRAPHY 



LOUGHRIDGE, R. H. 



1901. Tolerance of Alkali by Various Cultures. Cal. Agr. 

 Expt. Sta. Bui. 133. 



LYON, T. L. 



1907. Modifications in Cereal Crops Induced by Changes 



in Their Environment. Proc. Soc. Prom. Agr. Sci. 1907. 



1910. The Relation of Wheat to Climate and Soil. Proc. 



Am. Soc. Agron. I., 108-125. 

 McCooL, M. M. 



1913. The Action of Certain Nutrient and Non-Nutrient 

 Bases on Plant Growth. Corn. Univ. Agr. Expt. Sta. 

 Mem. 2. 



MACDOUGAL, D. T. 



1903. The Influence of Light and Darkness upon Growth 

 and Development. Weather Bur. Mon. Rev. Apr. 1903. 

 1913. Aus Nordamerikas Wiisten. Die Erde I., 338. 

 MARBUT, C. F., BENNETT, H. H., LAPHAM, J. E. AND LAPHAM, 



M. H. 



1913. Soils of the United States. U. S. Bur. Soils, Bui. 96. 

 MERRIAM, C. HART. 



1894. Laws of Temperature Control of the Geographic 

 Distribution of Terrestrial Animals and Plants. Nat. 

 Geogr. Mag. VI., 1894. 

 1898. Life Zones and Crop Zones of the United States. 



U. S. Dept. Agr. Div. Biol. Surv. Bui. 10. 

 PFEIFFER, T., BLANCK, E. AND FRISKE, K. 



1913. The Influence of Various Factors of Growth, especially 

 Water, on the Maximum Yield in Pot Experiments. 

 Landw. Versuchstat. LXXXIL, 237-298. 

 PLUMB, C. S. 



1898. The Geographic Distribution of Cereals in North 



America. U. S. Dept. Agr. Div. Biol. Surv. Bui. 11. 

 POUND, R. AND CLEMENTS, F. E. 



1898. The Vegetation Regions of the Prairie Province. 



Bot. Gaz. XXV. 

 REDWAY, J. W. 



1894. The Treeless Plains of the United States. Geogr. 

 Jour. III. 



RlDGAWAY, C. B. 



1902. Experiments in Evaporation. Wy. Agr. Expt. Sta. 

 Bui. 52. 



SCHINDLER, FRANZ. 



1893. Der Weizen in seinen Beziehungen zum Klima und 

 das Gesetz der Korrelation. Paul Parey, Berlin. 



