264 ORGANISMS RESEMBLING THE CHOLERA SPIRILLUM. 



FIG. 117. 



Spirillum tyrogenum, colonies on gelatin plate : a, end of sixteen hours ; 6, end of 

 twenty-four hours ; c, end of thirty -six hours. X 80. (Fluegge.) 



lecting in the bottom in the form of a coiled mass. The gel- 

 atin is liquefied completely in about two weeks (Fig. 118). 



FIG. 118. 



a be d 



Stab culture of Deneke's cheese spirillum in gelatin, at 18 to 20 C. : a, after 

 twenty-four hours ; b, after forty-eight hours ; c, after seventy-two hours ; d, after 

 ninety-six hours. (Abbott.) 



A very sparse yellowish membrane is formed on agar. 



Blood-serum is rapidly liquefied. 



A very luxuriant moist yellow film, containing many long 



