XVI] VIBRIO AND SPIRILLUM 465 



as well as in its cultural character it resembles, but is not 

 quite identical with, Koch's cholera vibrio. Inoculated sub- 

 cutaneously into pigeons or guinea-pigs it proves very virulent, 

 producing acute disease and death ; fowls can be infected by 

 ingestion. On post-mortem examination of the infected animals 

 the intestines are found greatly congested and contain in their 

 cavity grumouss anguineous fluid. I'he spleen is not enlarged. 



Fig. 183. — Film Specimen of a Culture of Vibrio Metchnikovi. 

 >: 1000. 



The vibrio is copiously present in the intestinal fluid and in 

 the blood. 



Gamaleia made the statement that the vibrio Metchnikovi 

 and the cholera vibrio are mutually protective for the pigeon; 

 that is to say, that a pigeon that has survived disease caused 

 by the injection of a non-fatal dose of one vibrio is protected 

 against a subsequent injection of a fatal dose of the other. 



H H 



