SPIRILLA RESEMBLING CHOLERA. 283 



cipitate rapidly ; a rather smeary, whitish mycoderma is 

 generally formed upon the surface. The much more ex- 

 tensive and more rapid liquefaction of the medium, the 

 wider top to the funnel-shaped liquefaction at the surface, 



FIG. 83. Spirillum of Finkler and Prior : gelatin puncture-cultures aged 

 forty-eight and sixty hours (Shakespeare). 



the absence of the air-bubble, and the clouded nature of 

 the liquefied material, all serve to differentiate it from the 

 cholera spirillum. 



Upon agar-agar the growth is also very 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. 



The cultures upon potato are also very different from 

 those of cholera, for instead of a temperature of 37 C. 

 being required for a rapid development, the Finkler and 

 Prior spirilla grow rapidly at the room-temperature, and 

 produce a grayish-yellow, slimy, shining layer, which 

 may cover the whole of the culture-medium. 



Blood-serum is rapidly liquefied by the growth of the 

 organism. 



