86 SPIRILLUM TYROGENUM 



A further resemblance obtains between this 

 spirillum and that of Koch in that each gives the 

 cholera red reaction when their cultures in Peptone- 

 salt are treated with a few drops of strong sulphuric 

 acid. In the lower animals this organism is more 

 virulent than the Sp. Cholerse, and subcutaneous 

 injection in the pigeon kills the animal in 24 hours ; 

 the spirillum is found in considerable numbers 

 in the blood and internal organs. 



The Spirillum of Deneke was isolated from decay- 

 ing cheese. In culture (Fig. 85) it is very similar 

 to the cholera spirillum, but is morphologically less 

 like it than the two preceding organisms, and is 

 nearly without pathogenic action. 



