REFERENCES 139 



stimulated by the addition of 50,000 parts per million of 

 potassium chloride or sodium chloride, but that spore 

 formation was decreased, while 100,000 parts per million 

 usually arrested development. 



REFERENCES 



1. Barnes, J. H., and Ali, Barkat. Alkali Soils: Some Biochemical 



Factors in their Reclamation. Agr. Jour. India, 12 (1917), pp. 368- 

 389. (Abs. E. S. R. 38, p. 815.) 



2. Brown, P. E., and Hitchcock, E. B. The Effects of Alkali Salts on 



Nitrification. Soil Sci. 4 (1917), pp. 207-229. 



3. Brown, P. E., and Johnson, D. R. Effects of Certain Alkali Salts 



on Nitrification. Iowa Sta. Res. Bui. 44 (1918), 24 pp. 



4. Greaves, J. E. Azofication. Soil Sci. 6 (1918), pp. 163-217. 



5. Greaves, J. E. The Influence of Salts on the Bacterial Activities of 



the Soil. Soil Sci. 2 (1916), pp. 443-480. 



6. Greaves, J. E., Carter, E. G., and Goldthorpe, H. C. Influence 



of Salts on the Nitric-nitrogen Assimilation. Jour. Agr. Res. 16 

 (1919), pp. 107-135. 



7. Hills, T. L. Influence of Nitrates on Nitrogen Assimilation. Jour. 



Agr. Res. 12 (1918), pp. 183-230. 



8. Kelley, W. P. Nitrification in Semiarid Soils. Jour. Agr. Res. 7 



(1916), pp. 4I7-437- 



9. Lipman, C. B. Antagonism between Anions as Affecting Ammoni- 



fication in Soils. Centbl. f. Bakt. Abt. 2, Bd. 36 (1913), pp. 382- 



394- 



10. Lipman, C. B. Toxic Effects of Alkali Salts in Soils on Soil Bacteria. 



II. Nitrification. Centbl. f. Bakt. Abt. 2, Bd. 33 (1912), 



PP- 35-3i3- 



11. Lipman, C. B. Toxic Effects of Alkali Salts on Soil Bacteria. I. Am- 



monification. Centbl. f. Bakt. Abt. 2, Bd. 32 (191 1), pp. 58-64. 



12. Lipman, C. B., Burgess, P. S., and Klein, M. A. Comparison of the 



Nitrifying Powers of Some Humid and Some Arid Soils. Jour. 

 Agr. Res. 7 (1916), pp. 47-82. 



13. Lipman, C. B., and Fowler, T. W. Preliminary Experiments of Some 



Effects of Leaching on Soil Flora. Soil Sci. 1 (1916), pp. 291-297. 



14. Lipman, C. B., and Sharp, L. T. Toxic Effects of Alkali Salts in Soils 



on Soil Bacteria. III. Nitrogen Fixation. Centbl. f. Bakt. Abt. 

 2, Bd. 35 (1912), pp. 647-655. 



