ACIDURIC BACTERIA 387 



in dextrose, lactose, saccharose and maltose; mannite was not fermented. 

 The morphology of the organism, the types of colonies produced on 

 dextrose agar, and its staining reactions resemble those of Bacillus 

 acidophilus. The production of gas in the sugar mentioned and 

 the relatively feeble growth in milk are its distinguishing cultural 

 characteristics. 



Sera of animals immunized to Bacillus acidophil-aerogenes failed 

 to agglutinate Bacillus acidophilus, and vice versa, indicating that the 

 two organisms are quite distinct entities. 



