A T itrogen by Azotobacter and the Groivth of the Organism . 887 
Literature cited. 
Ashby, S. F. : Journ. Agric. Science, ii, 1907-8, p. 54. 
Beijerinck : Centralbl. f. Bakt., vii, 1901, p. 561. 
Chester, G. K. : New Jersey State Expt. Station Report, 1904. 
Freudenreich, Ed. von : Centr. f. Bakt., ix, 1902, p. 514. 
Gerlach and Vogel : Centr. f. Bakt., viii, 1902, p. 669 ; ix, p. 817 ; x, 1903, p. 636. 
Hoffmann, C., and Hammer, B. W. : Univ. of Wisconsin, Agric. Expt. Station Research Bulletin, 
xii, June 1910. 
Kaserer, Hermann : Ber. d. Deutsch. Bot. Gesellsch., xxviii, 1910, pp. 208-12. 
Koch, A. : Lecture before Econ. Soc. of Saxony, Dec. 1903. Article in Lafar’s Handb. der tech- 
nischen Mykologie, 2nd Ed., 1904. 
, and Seydell, Siegfried : Centr. f. Bact., xxxi, 1911, pp. 570-7. 
Krainski, A. : Centr. f. Bakt., xx, 1908, p. 725. 
Krzemieniewski, H. (Mme) : Bull. Acad. Sci. Cracovie, 1910, pp. 376-413. 
Omeliansky, W. I,., and Ssewerowa, O. P. : Centr. f. Bakt., xxviii, 1911, p. 645. 
Remy, Th., and Ros:ng, G. : Centr. f. Bakt., xxx, 1911, p. 378. 
