PATHOGENIC BACTERIA. 325 



It is pathogenic for chickens, pigeons and guinea-pigs; less so 

 for mice and for rabbits. The comma-shaped organisms are 

 found in the blood in guinea-pigs, pigeons and young chicicens. 



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

 organism somewhat larger than the spirillum of cholera, some- 

 times exhibiting genuine spiral forms, and also, at times, 

 involution forms. It is motile and has a flagellum at one end. 



The developments of the colonies in gelatin and the lique- 



faction of this medium are more rapid than with the cholera 

 spirillum. At the end of twenty-four hours the colonies are 

 all circular, larger than those of the spiriUum of cholera, and 

 uniformly granular when slightly magnified. On the other 

 culture-media the growths are usually whitish. On potato it 

 produces an abundant, moist, grayish-yellow deposit, and grows 

 at the room-temperature. It Uquefies coagulated blood-serum; 

 milk becomes acid. In peptone solution it does not form indol. 

 It is less pathogenic to animals than the spirillum of cholera. 



* The magnification is a little greater than in the other photomicrographs. 



