268 



MAX LEVINE 



of 51 strains, and a sucrose negative, salicin negative subgroup of 

 38 organisms. 



The sucrose-negative, salicin-positive subgroup {B. coli). The 

 distribution of the 51 sucrose negative sahcin positive strains on 

 motility, dulcitol, and glycerol is indicated in table 5. 33 

 (64.9 per cent) are motile; 28 (54.9 per cent) form gas from dulci- 

 tol, and 48 (94.3 per cent) from glycerol. The extremely small 

 proportion of glycerol negative strains (5.7 per cent) eliminates 



TABLE 5 



Showing correlation of characters among 51 sucrose negative — salicin positive strains 

 of the coli group. [B. coli) 



* Coefficient of correlation for motility and dulcitol = 0.02. 



this alcohol from further statistical consideration. From table 

 5 it is seen that motility and dulcitol are not correlated. Further 

 subdivision on correlated characters is not feasible. This entire 

 group then is regarded as the species B. coli and two varieties 

 may be formed on motility — the motile B. coli-communis and the 

 non-motile B. coli-immobilis. 



The sucrose negative, salicin negative subgroup {B. acidi-lactici) . 

 Of the 38 organisms which were negative for both sucrose and 

 salicin, 20 (52.7 per cent) were motile, 28 (73.7 per cent) formed 

 indol, 21 (55.3 per cent) were positive with glycerol, while only 

 5 (13.2 per cent) formed gas from dulcitol as shown in table 6. 

 From table 6a it appears that motility is correlated with dulcitol 

 fermentation and indol, and has a slightly higher coefficient with 



