SPIRILLUM OF FINKLER-PRIOR. 



261 



media. Its growth in gelatin is characterized by an ex- 

 tremely rapid and characteristic liquefaction of the medium. 

 On gelatin plates small white colonies form in the medium. 

 These colonies are finely granular, with very sharply marked 

 borders and of a yellowish-brown color, which is more 

 intense in the centre than at the periphery of the colony. 

 They are surrounded within a few days by a zone of lique- 

 faction. These colonies can be differentiated from those of 

 the cholera spirillum by a more sharply defined border and 



FIG. 114. 



Spirillum of Finkler and Prior : colony twenty-four hours old. as seen upon a 

 gelatin plate. X 100. (Fraenkel and Pfeiffer.) 



a darker color, and they are also less granular (Fig. 114). 

 After a time they resemble each other so closely that differ- 

 entiation is impossible. 



In the gelatin stab liquefaction progresses very rapidly and 

 forms a typical stocking-shape, which is filled with a cloudy 

 liquid. The surface of the medium is usually covered with 

 a thick whitish membranous growth. Liquefaction occurs 

 much more rapidly than in cholera cultures. The stocking- 

 shaped liquefaction is peculiar to this organism, and while 



