The Nitrogen Metabolism 

 of Micro-organisms 



B. A. FRY, 



B.A., Ph.D. 



Lecturer in Microbiology 



in the University of Sheffield 



WITH 3 PLATES & 14 DIAGRAMS 



LONDON: METHUEN & CO. LTD 

 NEW YORK: JOHN WILEY & SONS, INC. 



