270 University of California Publications in Agricultural Sciences [Vol. 3 



LITERATURE CITED 



i Allison, F. E., and Coleman, D. A. 



Biological variations in soil plots as shown by different methods of sampling. 

 Soil Science, vol. 3, pp. 499-514, 1917. 



2 Alway, F. J., and Trumball, R. S. 



On the sampling of prairie soils. Ann. Rep. Nebraska Agr. Exp. Sta., vol. 

 25, pp. 35-52, 1912. 



Alway, F. J., and Files, E. K. 



On the sampling of cultivated soils. Ibid., pp. 52-56, 1912. 



Alway, F. J., and Bishop, E. S. 



The nitrogen content of some Nebraska soils. Ibid., pp. 129-160, 1912. 



3 Kaserer, H. 



Beitrage zur Frage der Festellung des Nahrstoffgehaltes einer Ackerparzelle. 

 Ztsch. Landw., Yersuchsw. Osterr., vol. 13, pp. 742-747, 1910. Cited from 

 E. S. R., p. 320, 1911. 



■i American Society of Agronomy. 



Report of the Committee on Standardization of Field Experiments. Jour. 

 Amer. Soc. Agron., vol. 9, pp. 402-409, 1917. 



s Lipman, C. B., and Sharp, L. T. 



Studies on the phenoldisulphonic acid method for determining nitrates in 

 soils. Univ. Calif. Publ. Agr. Sci., vol. 1, pp. 23-37, 1912. 



e Davenport, C. B. 



Statistical methods (ed. 2; New York, Wiley, 1904). 



- Robertson, T. Brailsford, and Ray, L. A. 



Experimental studies in growth. II. The normal growth of the white mouse. 

 Jour. Biol. Chem., vol 24, pp. 374, 1916. 



