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 



A. PaRKKU rilTCHENS 



Editor-in-Chief 

 C.-E. A. WINSLOW 



Yale Medical School, New Haven, Conn. 



R. E. Buchanan, Ex officio 



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. Pennington 

 E. B. Phelps 

 L. F. Rettqer 

 L. A. Rogers 



M. J. Rosenad 

 W. T. Sedgwick 

 F. L. Stevens 

 A. W. Williams 

 H. Zinsser 



CONTENTS 



S. Henry Ayers and Philip Rupp. A Synthetic Medium for the Direct Enumeration 



of Organisms of the Colon-Aerogenes Group 433 



I. J. Kligi.er and J. Defandorfer. The Endo Medium for the Isolation of B. 



Dysenteriae and a Double Sugar Medium for the Differentiation of B. Dysenteriae, 



Shiga and Flexner 437 



I. J. Kligler. Note on Cross-Agglutination of B. Coli Communis and B. Dysenteriae 



Shiga 441 



R. S. Breed, H. J. Conn and J. C. Baker. Comments on the Evolution and 



Classification of Bacteria 445 



R. E. Buchanan. Studies in the Classification and Nomenclature of the Bacteria. 



IX. The Subgroups and Genera of the Thiobacteriales 461 



Selman A. Waksman. Studies on Proteolytic Activities of Soil Microorganisms, with 



Special Reference to Fungi 475 



Geo. C. Bunker, Edward J. Tucker and Howard W. Green. A Modification of 



the Technique of the Voges and Proskauer Reaction 493 



Abstracts of American and foreign bacteriological literature appears in a separate 

 journal. Abstracts of Bacteriology, published bi-monthly by the Williams & Wilkins Com- 

 pany, under the editorial direction of the Society of American Bacteriologists. Price, per 

 volume, $5.00 North America; $5.50 elsewhere. Vol. I, 1917. Vol. II, 1918.- 



