INDEX 581 



Perry, Margaret C, and Alonfort, W. F. Some atypical colon-aerogenes 



forms isolated from natural waters 53 



Plaisance, G. P., and Hammer, B. W. The mannitol-producing organisms in 



silage 431 



Powdered litmus milk. A product of constant quality and color which can 



be made in any laboratory 43 



Principles concerning the isolation of anaerobes. Studies in pathogenic 



anaerobes II 445 



Progress report for 1920 committee on bacteriological technic 135 



Proteolytic enzymes. On the growth and the, of certain anaerobes 419 



Randall, Samuel B., and Foster, Laurence F. A study of the variations in 



hydrogen-ion concentration of broth media 143 



Relation, The, of hydrogen-ion concentration to the growth, viability and 



fermentative activity of Streptococcus heynolyticus 161 



Ripening of corn silage. Bacteria concerned in the 45 



Rose bengal as a general bacterial stain 253 



Roth, George B. Method for the intravenous injection of guinea-pigs 249 



Rush, J. E., and Palmer, G. A. On decreasing the exposure necessary for the 



gelatin determination 571 



Salt effects in bacterial growth. I. Preliminary paper 511 



Sawyer, Mary V., and Norton, John F. Indol production by bacteria 471 



Schwarze, Herman R., and Graham, Robert. Botulism in cattle 69 



Sedgwick, William Thompson, 1855-1921 255 



Sherman, James M. The cause of eyes and characteristic flavor in Emmental 



or Swiss cheese 379 



, The gas production of Streptococcus kefir 127 



Shunk, Ivan V. Notes on the flagellation of the nodule bacteria of Legumi- 



nosae 239 



and Wolf, Frederick A. Solid culture media with a wide range of hydro- 

 gen or hydroxyl ion concentration 325 



Silage, com. Bacteria concerned in the ripening of 45 



, The mannitol-producing organisms in 431 



Solid culture media with a wide range of hydrogen or hydroxyl ion concen- 

 tration 325 



Some atypical colon-aerogenes forms isolated from natural waters 53 



Spiral bodies in bacterial cultures 371 



Stain, A new modification and application of the Gram 395 



, Rose bengal as a general bacterial 253 



Streptococcus hemolyticus, The biochemistry of ■ • • 211 



, The relation of hydrogen-ion concentration to the growth, via- 

 bility, and fermentative activity of 161 



kefir, The gas production of _ ; ■ • 127 



Studies in pathogenic anaerobes II. Principles concerning the isolation 



of anaerobes ^- • • '"^ 



IV. Suggestions concerning a rational basis for the classi- 

 fication of the anaerobic bacteria 521 



