58 



MARGARET C. PERRY AND W. F. MONFORT 



The first six groups of strains (uric acid positive adonitol nega- 

 tive) may be regarded as varying about the third, which is 

 typical '^ non-fecal aerogenes." Those grouped under numbers 

 seven to ten inclusive may be thought of as variants of the so- 

 called "fecal aerogenes type" (number eight uric acid positive, 

 adonitol positive). Those grouped under numbers eleven to 



TABLE 1 

 Provisional arrangement of strains isolated from water 



sixteen inclusive (uric acid negative, adonitol positive or nega- 

 tive) may be variants of number 13 — typical Bad. coli. 



From numbers 1 to 6 and from 7 to 10 there is progressive 

 increase in net acidity to the limit of pH 5.8; from 11 to 16 there 

 is a decrease in acid formation, and from 17 to 19 there is irregu- 

 larity in acidity and in gas formation in lactose. Five spore- 

 bearing forms were isolated, which are fully described in a 

 forthcoming paper. 



