CHARACTERISTICS AND DISTRIBUTION OF THE 
COLON-AEROGENES GROUP * 
L. A. RoGers 
INTRODUCTION 
The results of a series of investigations carried on in this 
laboratory on the gas-forming bacteria, commonly known as 
the colon-aerogenes group, have appeared in various journals, 
This paper has offered an opportunity to bring these results to- 
gether and present them in a briefer and more concise form 
t an has been possible in the earlier papers. The results 
which will be discussed in this paper represent the accumula- 
tive work of a number of persons for which the writer has 
no desire to take undue eredit. Particular credit is due my 
ceclHeague, Dr. Clark, who has been responsible for the greater 
* Published by permission of the Secretary of Agriculture. 
1L. A. Rogers, W. M. Clark and B, J. Davis, The Colon Group of Bac- 
teria in Jour, Inf. Dis., 14, 8, pp. 411-475, 1914. 
L. A. Rogers, W. M. Clark and A. C. Evans, The Characteristics of Bac- 
teria of the Colon Type Found in Bovine Feces in Jowr. Inf. Dis., 15, 1, 
pp. 99-1238, 1914. 
Wm. Mansfield Clark, The Final Hydrogen Ion Concentrations of Cul- 
tures of Bacillus Coli in Jour. Biol. Chem., 22, 1, pp. 87-98, 1915. 
L. A. Rogers, W. M. Clark and A. C. Evans, The Characteristics of Bac- 
teria of the Colon Type Occurring ow Grains in Jour. Inf. Dis., 17, 1, 
pp. 137-159, 1915. ; 
W. M. Clark and H. A. Lubs, The Differentiation of Bacteria of the 
Colon-Aerogenes Family by the Use of Indicators in Jour. Inf, Dis., 17, 1, 
pp. 160-173, 1915. 
L. A. Rogers, W. M. Clark and H. A. Lubs, The Characteristics of Bac- 
teria of the Colon-Aerogenes Type Occurring in Human Feces. (Unpub- 
lished. ) 
S. H. Ayers and P. Rupp, Simultaneous Acid and Alkaline Bacterial Fer- 
mentations from Dextrose and the Salts of Organic Acids Respectively. 
(Unpublished. ) 
L. A. Rogers, The Occurrence of Different Types of the Colon-Aerogenes 
Group in Water. (Unpublished. ) 
jen en CHINAS ce rae 
: sila t yo pplication in Bacteriology in Jour. Bact, 
» J, pp. 1-34; 2, pp. 109-186; 3, pp. 191-286, 1917, 
