44 Comparative Studies 



also belongs to the former group. These groups of organ- 

 isms are evidently closely related to the I/5ffler bacillus. 

 I am inclined to believe, with Fraenkel, Escherich, Spronck 

 and Trumpp, that these organisms are distinct organisms, 

 and that they are not a virulent L,6ffler bacilli. There is 

 so far no evidence to believe that they are attenuated 

 Iv6ffler bacilli. All the experimental evidence points to 

 the opposite opinion. Roux and Yersin, L,6ffler and von 

 Hofmann-Wellenhof were inclined to believe they were 

 non-virulent Loffler bacilli ; this opinion being not the one 

 now generally held by bacteriologists. 



TABLE I. 



The following table shows the results obtained with 

 some of the cultures which were carefully studied in their 

 behavior on the different culture media, presenting the 

 comparative results in a more graphic form : 



