622 



The Finkler and Prior Spirillum 



Gelatin Punctvires. — 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 

 liquefaction of the medium, the wider top to the funnel, the absence of the air- 



Fig. 248. — Spirillum of Finkler and Prior; colony twenty-four hours old, upon a 

 gelatin plate. X 100 (Frankeland Pfeiffer). 



Fig. 249. — Spirillum of Finkler and Prior; gelatin puncture cultures aged forty- 

 eight and sixty hours (Shakespeare;. 



bubble, and the clouded nature of the liquefied material, all serve to differentiate 

 the culture from the cholera spirillum. 



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. 



