CLASSIFICATION OF THE COLON-CLOACAE GROUP 



267 



any other character. Dulcitol and glycerol are not correlated 

 with each other, nor with indol and motility, but each has a high 

 coefficient of association with salicin. The coefficient for dulcitol 



TABLE 4 



Showing correlation of characters among 89 sucrose negative strains of the coli group 



TABLE 4 a 

 Coefficients of correlation for each pair of characters in table 4 



with sahcin is 0.78 and for glycerol with sahcin is 0.86. Indol is 

 also correlated with salicin; all of the 10 indol negative strains are 

 also salicin negative. Differentiation is therefore made upon 

 salicin which gives a sucrose negative, salicin positive subgroup 



