570 s INDEX 



Perkins, R. G. A new apparatus for obtaining simultaneous cultures of any- 

 desired age for comparative study 23 



Petroleum-ether method, On the value of the, for the isolation of B. typhosus 



from feces ' 361 



Protein and non-protein nitrogen. Further studies on the utilization of 367 



Protein-free enzyme- and acid-digestion products, The growth of bacteria in 209 

 Proteolytic activities, Studies on, of soil microorganisms with special refer- 

 ence to fungi " 475 



enzymes, Studies on the, of soil fungi and actinomyces 509 



Prucha, M. J., Conn, H. J., Harding, H. A., Kligler, I. J., Frost, W. D., and 

 Atkins, K. N. Methods of pure culture study. Preliminary report of 



the committee on the chart for identification of bacterial species 115 



Pure culture study, Methods of 115 



Rahe, Alfred H. The classification of the aciduric bacteria 407 



Reaction, A modification of the technique of the Voges and Proskauer 493 



Report, Preliminary, of the committee on the chart for identification of bac- 

 terial species 115 



Rettger, Leo F. The science of bacteriology and its relation to other sciences. 103 



and Berman, Nathan. Bacterial nutrition: Further studies on the 



utilization of protein and non-protein nitrogen 367 



. The influence of carbohydrate on the nitrogen metabolism of bac- 

 teria 389 



and Robinson, Harold C. The growth of bacteria in protein-free en- 

 zyme- and acid-digestion products 209 



Hobinson, Harold C, and Rettger, Leo F. The growth of bacteria in pro- 

 tein-free enzyme- and acid-digestion products 209 



Rogers, L. A. The occurrence of different types of the colon-aerogenes 

 group in water 313 



, Clark, William Mansfield, and Lubs, Herbert A. The characteristics 



of bacteria of the colon type occurring in human feces 231 



Rupp, Philip, and Ayers, Henry S. A synthetic medium for the direct enu- 

 meration of organisms of the colon-aerogenes group 433 



Science of bacteriology and its relation to other sciences. The 103 



Sears, H. J., and Case, Lulu L. Some observations on the efficiency of the 

 present standard agar for the estimation of bacteria in milk 531 



Sherman, J. M., and Albus, W. R. Some characters which diff'erentiate the 

 lactic-acid streptococcus from streptococci of the pyogenes type occur- 

 ring in milk 153 



Simple and practical medium for differentiating B. typhosus, B. paratypho- 



sus A, B. paratyphosus B, B. enteritidis and B. coli, A 19 



Simplified confirmatory test for B. coli, A 555 



Soil microorganisms, Studies on proteolytic activities of, with special ref- 

 erence to fungi 475 



Some characters which differentiate the lactic-acid streptococcus from strep- 

 tococci of the pyogenes type occurring in milk 153 



Spirillaceae and nitrobacteriaceae, Subdivisions and genera of the 175 



Spirochaetales, Subgroups and genera of the myxobacteriales and 541 



Sporulating anaerobes, A brief note on the use of gentian violet in presump- 

 tive tests for B. coli in milk with reference to 355 



