604 INDEX 



Reaction, Changes in, as a result of the growth of actinomycetes upon 

 culture media. Studies in the metabolism of actinomycetes. IV 31 



Relative, The, effect of phosphate-acetate and of phosphate-phthalate 

 buffer mixtures upon the growth of Endothia parasitica on malt extract 

 and corn meal media 305 



Report of the Committee on the Descriptive Chart for 1919 127 



of Committee on Descriptive Chart. Part II. Report of progress 



during 1919 315 



— — . Part III. A modification of the Gram stain 321 



, final, of the Committee of the Society of American Bacteriologists on 



Characterization and Classification of Bacterial Types. The families 

 and genera of the bacteria _ 191 



Resistance to salt. The influence of various chemical and physical 



agencies upon Bacillus botulinus and its spores 553 



Rettger, Leo F., and Chen, Chen Chong. A correlation study of the colon- 

 aerogenes group of bacteria, with special reference to the organisms 

 occurring in the soil 253 



Richards, J. H. Bacteriologic studies in chronic arthritis and chorea 511 



Rogers, L. A., Winslow, C.-E. A., Chairman, Broadhurst, Jean, Buchanan, 

 R. E., Krumwiede, Charles, Jr., and Smith G. H. The families and 

 genera of the bacteria. Final report of the Committee of the Society 

 of American Bacteriologists on Characterization and Classification of 

 Bacterial Types 191 



Rothberg, William, Winslow, C.-E. A., and Parsons, Elizabeth I. Notes 

 on the classification of the white and orange staphylococci 145 



Rupp, Philip, and Ayers, S. Henry. Extracts of pure dry yeast for culture 

 media 89 



Rupp, Philip, Ayers, S. Henry, and Mudge, Courtland S. The use of washed 



agar in culture media 589 



Salmon, Bacterial groups in decomposing 543 



, Bacterial decomposition of 353 



"Salt effects," the, of phosphates, A spectrophotometric study of, upon 



the color of phenolsulfonphthalein salts and some biological applications. 169 

 Salt, Resistance to. The influence of various chemical and physical 



agencies upon Bacillus botulinus and its spores 553 



Schlesinger, M. J., Bronfenbrenner, J., and Soletsky, D. On methods of 

 isolation and identification of the members of the colon-typhoid group 



of bacteria. The study of bactericidal action of CR indicator 79 



Shunk, Ivan V. A modification of Loeffler's flagella stain 181 



Smith, G. H., Winslow, C.-E. A., Chairman, Broadhurst, Jean, Buchanan, 

 R. E., Krumwiede, Charles Jr., and Rogers, L. A. The families and 

 genera of the bacteria. Final report of the Committee of the Society of 

 American Bacteriologists on Characterization and Classification of 



Bacterial Types 191 



Sodium chloride, Data on. A method of determining the relative toxicity 



of sodium, potassium, lithium, and other ions toward Endothia parasitica. 309 

 Soil, A correlation study of the colon-aerogenes group of bacteria with 



special reference to the organisms occurring in the : 253 



