PATHOGENIC BACTERIA. 40 1 



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

 and young chickens. 



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 



' V' HP" 



- > ~_ 



** 

 V 



-. - ~ * ~ 



*" 



$f~ * * S ' 



F -T , -* 



f 



, ( 



00. 



f* * 



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. 

 26 



