INDEX 579 



Gillespie, Louis J. Color standards for the colorimetric measurement of 



H-ion concentration 399 



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



Gram stain, A new modification and application of the 395 



Growth, bacterial. Salt effects in. I. Preliminary paper 511 



, On the, and the proteolytic enzymes of certain anaerobes 419 



Guinea-pigs, Method for the intravenous injection of 249 



H-ion concentration. Color standards for the colorimetric measurement of. 399 



Hall, Ivan C. Chemical criteria of anaerobiosis with special reference to 



methylene blue 1 



Hamilton, Herbert W. Powdered litmus milk. A product of constant 



qualit}' and color which can be made in any laboratory 43 



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

 in silage 431 



Harmon, G. E., Conn, H. J., Chairman, Atkins, K. N., Kligler, I. J., Norton, 



J. F. Progress report for 1920 committee on bacteriological technic... . 135 



Heineman, P. G., and Hixson, Charles R. Bacteria concerned in the ripen- 

 ing of corn silage 45 



Heller, Hilda Hempl. Principles concerning the isolation of anaerobes. 



Studies in pathogenic anaerobes II 445 



. Suggestions concerning a rational basis for the classification of the 



anaerobic bacteria. Studies in pathogenic anaerobes IV 521 



Hemolysins, The nature of 89 



Hixson, Charles, and Heineman, P. G. Bacteria concerned in the ripening 



of corn silage 45 



Holly, L. E., and Council, J. T. The nature of hemolysins 89 



, Warden, C. C, and Connell, J. T. The nature of toxin. The antigens 



of Cory neb acterhi7n diphtheriae and Bacillus megatherium and their 

 relation to toxin 103 



Holm, George E., and Sherman, James M. Salt effects in bacterial growth. 



I. Preliminary paper 511 



Hucker, G. J. A new modification and application of the Gram stain 395 



Hydrogen or hydroxyl ion concentration. Solid culture media with a wide 



range of 325 



Hydrogen-ion concentration of broth media, A study of the variations in. . 143 



concentration. The relation of, to the growth, viability, and fermenta- 

 tive activity of Streptococcus hemolyticus 555 



Hydrogen ions, titration and the buffer index of bacteriological media 161 



Importance, The, of preserving the original types of newly described species 



of bacteria 133 



Indol production by bacteria 471 



test, Note on the, in tryptophane solution 85 



Intravenous injection of guinea-pigs. Method for the ^. 249 



Isolation of anaerobes, Principles concerning the. Studies in pathogenic 



anaerobes II 445 



