CLASSIFICATION OF THE COLON-CLOACAE GROUP 



271 



63 (67.8 per cent). The distribution with respect to these char- 

 acters and the correlation coefficients are shown in tables 7 and 

 7a respectively, where it is seen that motility correlates better 

 with dulcitol than does any other of the characters. It also 

 correlates best with sahcin. Motility is the best correlated 



TABLE 8 



Showing correlation of characters among 77 sucrose positive motile strains of the coli 



group. (B. communior) 



TABLE 8a 

 Coefficients of correlation for each pair of characters in table 8 



character. There are thus two subgroups, a sucrose-positive, 

 motile subgroup of 77 strains and a sucrose positive non-motile 

 subgroup comprising 16 strains. 



The sucrose positive motile subgroup (B. communior) . Inspec- 

 tion of tables 8 and 8a shows that among the sucrose positive 

 motile strains, neither indol production nor salicin fermentation 

 is correlated with other characters. Gas formation from dulcitol 



