JOURNAL OF BACTERIOLOGY 



OFFICIAL ORGAN OF THE SOCIETY OF AMERICAN BACTERIOLOGISTS 



DEVOTED TO THE ADVANCEMENT AND DIS- 

 SEMINATION OF KNOWLEDGE IN REGARD TO 

 THE BACTERIA AND OTHER MICRO-ORGANISMS 



Editorial Board 



Editor-in-Chief 

 C.-E. A. WINSLOW 



Yale Medical School, New Haven, Conn. 



A. Parker Kitchens 



F. C. Harrison, Ex officio 



Principal, MacDonald College, 



P. Q., Canada 



C. C. Bass 

 R. E. Buchanan 

 P. F. Clark 

 F P. Gay 



F. P. GORHAM 



F. C. Harrison 



Advisory Editors 



H. W. Hill 

 E. O. Jordan 

 A. I. Kendall 



C. B. LiPMAN 



C. E. Marshall 



V. A. Moore 

 M. E.Penington 

 F. B. Phelps 

 L. F. Rettger 

 L. A. Rogers 



M. J. RoSENAtJ 



W. T. Sedgwick 

 F. L. Stevens 

 A. W. Williams 

 H. Zinsser 



CONTENTS 



George E. Holm and James M. Sherman. Salt Effects in Bacterial Growth. I. Pre- 

 liminary Paper 511 



Hilda Hempl Heller. Suggestions Concerning a Rational Basis for the Classification 

 of the Anaerobic Bacteria. Studies in Pathogenic Anaerobes. IV. I. Prelim- 

 inary Paper 521 



J. Howard Brown. Hydrogen Ions, Titration and the Buffer Index of Bacteriological 

 Media 555 



J. E. Rush and G. A. Palmer. On Decreasing the Exposure Necessary for the Gel- 

 atin Determination 571 



Harold Macy. Chart of the Families and Genera of the Bacteria 575 



Index to Volume VI 577 



Abstracts of American and foreign bacteriological literature appear in a separate journal, 

 Abstracts of Bacteriology, published monthly by the Williams & Wilkins Company, under 

 the editorial direction of the Society of American Bacteriologists. Back tolumes can be 

 furnished in sets consisting of Volumes I, II, III and IV. Price per set, net, postpaid, $24.00, 

 United States, Mexico, Cuba; $25.00, Canada; $26.00, other countries. Subscriptions are in 

 order for Volume V, 1921, Price, per volume, $5.00, United States, Mexico, Cuba; $5.25, 

 Canada; $5.50. other countries. 



