PATHOGENIC BACTERIA. 40I 



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

 and young chickens. 



Vibrio Proteus (Finlder 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 









■ ••'»^, ' 



Fig. 104. — Vibrio proteus.* 



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

 all circular, larger than those of the spirillum 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 liquefies coagulated blood- 

 serum; milk becomes acid. In peptone solution is does not 

 usually form indol, but occasionally it does so. It is less 

 pathogenic to animals than the spirillum of cholera. It was 

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



