620 The Finkler and Prior Spirillum 



a zone of sharply circumscribed liquefied gelatin. Careful 

 examination with a high-power lens shows rapid movement 

 of the granules in the colony. 



Gelatin Punctures. In gelatin punctures the growth 

 takes place rapidly along the whole length of the puncture, 

 forming a stocking-shaped liquefaction filled with cloudy 

 fluid which does not precipitate rapidly; a rather smeary, 

 whitish scum is usually formed upon the surface. The 

 more extensive and more rapid the liquefaction of the 

 medium, the wider the top to the funnel, the absence of the 

 air-bubble, and the clouded nature of the liquefied material, 



^HP** 



Fig. 213. Spirillum of Finkler and Prior, from an agar-agar culture. 

 X 1000 (Itzerott and Niemann). 



all serve to differentiate the culture from the cholera spiril- 

 lum. 



Agar-agar. Upon agar-agar the growth is also rapid, 

 and in a short time the whole surface of the culture medium 

 is covered with a moist, thick, slimy coating, which may 

 have a slightly yellowish tinge. 



Bouillon. In bouillon the organism causes a diffuse 

 turbidity with a more or less distinct pellicle on the surface. 

 In sugar-containing culture media it causes no fermenta- 

 tion and generates no gas. 



Potato. The cultures upon potato are also different 

 from those of the cholera organism, for the Finkler and Prior 

 spirilla grow rapidly at the room temperature, and produce 



