262 



MAX LEVINE 



was plated out on brilliant green agar. Ten colonies were fished 

 into motility agar and starch; three were non-motile starch fer- 

 menters, three were motile and did not attack starch, while four 

 were both motile and starch fermenters thus indicating that, in 

 this instance at least, the presumably overlapping or intermediate 



TABLE 2 



Showing correlation of indol, dulcitol, and iriulin for 62 strains of B. aerogenes 



• Eight cultures not tested in inulin. 



TABLE 2a 

 Coefficient of correlation for each -pair of characters in table 



strains are in all probability merely mixed cultures. It is not 

 contended that intermediate strains do not occur; they undoubt- 

 edly do ; but it is desired to point out that these have been over 

 emphasized in the past and that the plating method cannot al- 

 ways be relied upon to yield pure cultures. 



B. cloacae may be defined as a gram negative short rod which 

 ferments lactose weakly; forms acetylmethylcarbinol from glu- 

 cose; is alkaline to methyl-red; motile; rarely forms indol; prac- 



