324 MANUAL OF BACTERIOLOGY. 



cholera. It grows upon the usual media. Blood-serum is 

 liquefied by it. The growth on agar is grayish to yellowish, 

 and abundant. It forms a pellicle on bouillon. In milk 

 an acid reaction is developed with coagulation. In peptone 

 solution it produces indol and nitrites like the spirillum of 

 cholera. It is said to lead to the production of indol more 

 intensely than the spirillum of cholera. 



It is killed by a temperature of 50 C. in five minutes. 

 It was discovered in chickens suffering from gastro-ente- 



FIG. 94. 



ritis. It is pathogenic to chickens, pigeons and guinea- 

 pigs, less so to mice and to rabbits. The comma-shaped 

 organisms are found in the blood in guinea-pigs, pigeons 

 and young chickens. 



Vibrio proteus (of Finkler and Prior). A comma-shaped 

 organism somewhat larger than the spirillum of cholera, 

 sometimes exhibiting genuine spiral forms, and also, at 



1 The magnification is a little greater than in the other photomicro- 

 graphs. 



