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 inulin for 62 strains of B. aerogenes 



Eight cultures not tested in inulin. 



TABLE 2A 



Coefficient of correlation for each pair of characters in table 2 



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- 



