LITERATURE 43 



5. Russell, E. J., and others. The Micro-organisms of the soil. Longmans, 



Green & Co. London, 1923. 



6. Stephenson, M. Bacterial metaboHsm. Longmans, Green & Co. 1930. 



7. Tanner, F. W. Bacteriology — A Textbook of Microorganisms. John 



Wiley & Sons, Inc. New York, 1929. 



8. Waksman, S. a. Principles of soil microbiology. The Wilhams & Wilkins 



Co. Baltimore, 1927. 



