INDEX 621 



Influence of vacuum upon growth of some anaerobic spore-bearing bacteria.. 283 

 Investigation, An, of American gentian violets. Report of committee on 



bacteriological technic 629 



, , of American stains. Report of committee on bacteriological 



technic 127 



Ishii, O. A study of spontaneous agglutination in the colon-typhoid group 



of bacilli 71 



Studies upon agglutination in the colon-typhoid group of bacilli 39 



Isolation and cultivation of Thiobacilltis thiooxidans, A solid medium for the. 



Microorganisms concerned in the oxidation of sulfur in the soil, IV. . . . 605 

 of bacteria in pure culture from single colls, Method for the, and pro- 

 cedure for the direct tracing of bacterial growth on a solid medium 537 



Joffe, J. S. and Waksman, Selman A. Microorganisms concerned in the oxi- 

 dation of sulfur in the soil. II. Thiobacillns thiooxidans, a new sulfur- 

 oxidizing organism isolated from the soil 239 



Koser, S. A. and Skinner, W. W. Viability of the colon-typhoid group in 

 carbonated water and carbonated beverages Ill 



Lactic acid bacteria: Studies on the biology of. a summary of personal 

 investigations 271 



Lag period, Salt effects in relation to the, and velocity of groivth. Salt 

 effects in bacterial growth, III 583 



Litmus, Substitution of brom-thymol-blue for, in routine laboratory work. . 301 



Medalia, L. S. Further observations on "color standards" for the colori- 



mctric determination of Il-ion concentration 589 



Medium, bacteriological, Transparent milk as a 511 



, procedure for the direct tracing of bacterial growth on a solid, Method 



for the isolation of bacteria in pure culture from single cells and 537 



, A solid, for the isolation and cultivation of Thiobacilltis thiooxidans. 



Microorganisms concerned in the o.xidation of sulfur in the soil, IV. . . . G05 



Method, A, for coimting the ninnber of fungi in the soil 339 



, A, for the cultivation of anaerobes 277 



for the isolation of bacteria in pure culture from single cells and pro- 

 cedure for the direct tracing of bacterial growth on a solid medium 537 



Method, A, of detecting rennet production by bacteria 447 



Methods of pure culture study. Report of committee on bacteriological 



technic 519 



Methylene blue. The use of domestic, in staining milk by the Breed method.. 307 

 Microorganisms concerned in the oxidation of sulfur in the soil. I. Intro- 

 ductory 231 



. II. Thiflbacillus thiooxi- 

 dans, a new sulfur-oxidizing organism isolated from the soil 239 



. IV. A solid medium for 



the isolation and cultivation of Thiobacillus thiooxidans 605 



. V. Bacteria oxidizing 



sulfur under acid and alkaline conditions 609 



