JOURNAL OF BACTERIOLOGY 



OFFICIAI. ORGAN OK THli .SOCIKTY OF AMERICAN UACTF.RIOI.OGISIS 



DEVOTED TO THE ADVANCEMENT AND DIS- 

 SEMINATION OF KNOWLEDGE IN REGARD TO 

 THE BACTERIA AND OTHER MICRO-ORGANISMS 



Editorial Board 



Edilor-in-ChieJ 



C.-E. A. WINSLOW 



Yale Medical School, New Haveo, Conn. 



A. Parker Kitchens Lore A. Rogers, Ex officio 



Advisory Editors 



C C lUss F. P. GoRHAM C. E. Marshall M. J. Rosenad 



r'. e'. Buchanan F. C. Harrison V. A. Moore A. \V. Williams 



P F. Clark E. O. Jordan L. F. Rettger H. Zinsser 



F. P. Gat C. B. Lipman L. A. Rogers 



CONTENTS 



J. 0RSKOV. Method for the Isolation of Bacteria in Pure Culture from Single Cells 



and Procedure for the Direct Tracing of Bacterial Growth on a Solid Medium 537 



William S. Sturges and Leo F. Rettger. Bacterial Autolysis 551 



T. M. Rivers. Bacillus hemoglobinophilus canis (Friedberger) . (Hemophilus canis 



Evxend) 579 



J. M. Sherman, G. E. Holm and W. R. Albus. Salt Effects in Bacterial Growth. III. 



Salt Effects in Relation to the Lag Period and Velocity of Growth 583 



Leon S. Medalia. Further Observations on "Color Standards" for the Colorimetric 



Determination of H-Ion Concentration 589 



John Weixzirl. The Cause of Explosion in Chocolate Candies 599 



Selman A. Waksman. Microorganisms Concerned in the Oxidation of Sulfur in the 



Soil. IV. A Solid Medium for the Isolation and Cultivation of Thiobacillus thio- 



oxidans ^^ 



Selman A. Waksman. Microorganisms Concerned in the Ox,idation of Sulfur in the 



Soil. V. Bacteria Oxidizing Sulfur Under Acid and Alkaline Conditions 609 



Abstracts of .\merican and foreign bacteriological literature appear in a separate journal, 

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

 the editorial direction of the Society of .Vmerican Bacteriologists. Back volumes can be 

 furnished in sets consisting of Volumes I, II, III and IV. Price per set. net, postpaid, S24.00, 

 United States, Mexico, Cuba; S25.00, Canada; $26.00, other coimtries. Subscriptions are in 

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

 Canada; $5.50, other countries. 



