436 
Journal of Agricultural Research 
Vol. VII, No. 10 
LITERATURE CITED 
(1) Aluen, E. R. 
1915. The determination of nitric nitrogen in soils. In Jour. Indus, and Engin. 
Chem., v. 7, no. 6, p. 521-529, 1 fig. 
(2) -and Bonazzi, A. 
1915. On nitrification. Ohio Agr. Exp. Sta. Tech. Ser., Bui. 7, 42 p. Biblio¬ 
graphy, p. 41-42. 
(3) Beckwith, T. D., Vass, A. F., and Robinson, R. H. 
1914. Ammonification and nitrification studies of certain types of Oregon soils. 
Oreg. Agr. Exp. Sta. Bui. 118, 40 p., 30 fig. References, p. 40. 
(4) Bouluanger, E., and Massoe, L. 
1904. Etudes sur les microbes nitrificateurs. (Deuxi&me m6moire.) Ann. 
Inst. Pasteur, t. 18, no. 3, p. 181-196. 
(5) Burgess, P. S. 
1913. The aluminum reduction method as applied to the determination of 
nitrates in “alkali*' soils. In Univ. Cal. Pub. Agr. Sci., v. 1, no. 4, 
p. 51-62, illus. 
(6) Frankuand, P. F. 
1888. A gasometric method of determining nitrous acid. In Jour. Chem. Soc. 
[London], v. 53, p. 364-373, 1 fig. 
(7) Greaves, J. E. 
1913. The influence of arsenic upon the biological transformation of nitrogen in 
soils. In Biochem. Bui., v. 3, no. 9, p. 2-16. 
(8) —- 
1914. A study of the bacterial activities of virgin and cultivated soils. In 
Centbl. Bakt. [etc.], Abt. 2, Bd. 41, No. 11/17, p. 444-459. 
(9) — 
1916. Stimulating influence of arsenic upon the nitrogen-fixing organisms of the 
soil. In Jour. Agr. Research, v. 6, no, 11, p. 389-416, 5 fig. Litera¬ 
ture cited, p. 414-416. 
(10) Hilgard, E. W. 
1906. Soils . . . 593 p.,89 fig. New York. 
(11) Keluerman, K. F., and Wright, R. C. 
1914. Relation of bacterial transformations of soil nitrogen to nutrition of 
citrous plants. In Jour. Agr. Research, v. 2, no. 2, p. 101-113, 7 fig. 
, Literature cited,, p. 113. 
(12) Keuuey, W. P. 
1911. The assimilation of nitrogen by rice. Hawaii Agr. Exp. Bui. 24, 20 p. 
(13) — 
1912. The effects of calcium and magnesium carbonates on some biological 
transformations of nitrogen in soils. In Univ. Cal. Pub. Agr. Sci., 
v. 1, no. 3, p. 39-49* 
(1 4 ) - 
1915. Ammonification and nitrification in Hawaiian soils. Hawaii Agr. Exp. 
Sta. Bui. 37, 52 p. 
(15) - 
1916. Some suggestions on methods for the study of nitrification. In Science, 
n. s., v. 43, no. 1097, p. 30-33. 
(16) Lipman, C. B. 
1911. Toxic effects of “ alkali salts’' in soils on soil bacteria. I. Ammonifica¬ 
tion. In Centbl*. Bakt. [etc.], Abt. 2, Bd. 32, No. 1/2, p. 58-64, 1 fig. 
(17) - 
1912. The distribution and activities of bacteria in soils of the arid regions. 
In Univ. Cal. Pub. Agr. Sci., v. 1, no. 1, p. 1-20. 
(18) —- 
1912. Toxic effects of * ‘alkali salts' ’ in soils on soil bacteria. 11 . Nitrification. 
In Centbl. Bakt. [etc.], Abt. 2, Bd. 33, No. 11/14, p. 305-313, 2 fig. 
