IV CONTENTS 



Number 3, May, 1918 



Studies Relative to the Apparent Close Relationship Between Bad. pertussis 

 and B. bronchisepticus. I. Cultural Agglutination andAbsorption Reac- 

 tions. N. S. Ferry and Arlyle Noble 193 



The Growth of Bacteria in Protein-free Enzyme- and Acid-Digestion Prod- 

 ucts. Harold C. Robinson and Leo F. Rettger 209 



The Characteristics of Bacteria of the Colon Type Occurring in Human 

 Feces. L. A. Rogers, William Mansfield Clark and Herbert A. Lubs. . . 231 



A Statistical Classification of the Colon-Cloacae Group. Max Levine 253 



Studies on Fowl Cholera. V. The Toxins of Bacillus avisepticus. Philip 

 Hadley 277 



A Lactose Fermenting Yeast Producing Foamy Cream. O. W. Hunter. . . . 293 



Studies in the Nomenclature and Classification of the Bacteria. VII. The 

 Subgroups and Genera of the Chlamydobacteriales. R. E. Buchanan. . 301 



Early Instructors in Bacteriology in the United States (addenda). E. G. 

 Hastings and C. B. Morrey 307 



Number 4, July, 1918 



Studies Relative to the Apparent Close Relationship between Bact. pertussis 



and B. bronchisepticus . II. Complement Fixation Tests. N. S. Ferry 



and H. C. Klix 309 



The Occurrence of Different Types of the Colon-Aerogenes Group in Water. 



L. A. Rogers , 313 



The Elimination of Spurious Presumptive Tests for B. coli in Water by the 



Use of Gentian Violet. Ivan C. Hall and Lillian Jordan Ellefson 329 



A Brief Note on the Use of Gentian Violet in Presumptive Tests for B. coli 



in Milk with Reference to Sporulating Anaerobes. Ivan C. Hall and 



Lillian Jordan Ellefson 355 



On- the Value of the Petroleum-ether Method for the Isolation of B. typhosus 



from Feces. Lawrence A. Kohn and Charles Krumwiede, Jr 361 



Bacterial Nutrition: Further Studies on the Utilization of Protein and 



Non-Protein Nitrogen. Nathan Berman and Leo F. Rettger 367 



The Influence of Carbohydrate on the Nitrogen Metabolism of Bacteria. 



Nathan Berman and Leo F. Rettger 389 



Studies in the Nomenclature and Classification of the Bacteria. VIII. 



The Subgroups and Genera of the Actinomycetales. R. E. Buchanan.. 403 



The Classification of the Aciduric Bacteria. Alfred H. Rahe 407 



The Germicidal Action of Freezing Temperatures upon Bacteria. C. M. 



Hilliard and Mildred A. Davis 423 



Number 5, September, 1918 



A Synthetic Medium for the Direct Enumeration of Organisms of the Colon- 

 Aerogenes Group. S. Henry Ayers and Philip Rupp 433 



The Endo Medium for the Isolation of B. dysenteriae and a Double Sugar 

 Medium for the Differentiation of B. dysenteriae Shiga and Flexner. I. 

 J. Kligler and J. Defandorfer 437 



