CLASSIFICATION OF ACIDURIC BACTERIA 



419 



tural test. In the instance of organisms of the type of B. acido- 

 philus 90 per cent of the strains clotted milk, while with B. 

 acidophil-aerogenes this figure falls to 65. 



There is, in recent bacteriological literature, an instance illustra- 

 tive of the desirability for a definite classification of the aciduric 



6 



B. acicld^]iiVu6. 



B. o.cidopW\\- aero^6nt&, B. iuloaricuS 



Fig. 1. 



bacteria. Clark (1916), was unable to come to a definite con- 

 clusion as to the H ion concentration of the Bacillus hulgaricus 

 owing in part to his uncertainty as to the identity of the partic- 

 ular organisms with which he was dealing. A classification, 

 such as is given in the table below, would simplify investigations 

 involving aciduric bacilli. 



