128 



ESSENTIALS OF BACTERIOLOGY. 



Liquefies gelatine in a short 



It 



FIG. 67. 



Properties. It is very motile. 

 time. 



Growth. It grows quickly at ordinary room temperature. 

 is facultative aerobic. 



Colonies on Gelatine Plates. Round, finely granular colonies, 

 which in twenty-four hours are ten times as large as the cholera 

 colonies, and in forty-eight hours the whole plate is liquefied, 

 it being then impossible to distinguish any separate colonies. 

 The microscopic appearances in no way 

 resemble the cholera colony. 



Stab Cultures. The gelatine is lique- 

 fied from above downwards, like a stock- 

 ing in appearance, and in three days is 

 completely liquid. 



Potato. At ordinary temperature a 

 thick gray layer covering the whole sur- 

 face. 



Water. It soon perishes in water. 



Staining. Ordinary aniline dyes. 



Pathogenesis. For man it has no spe- 



FIG. 66. 



-X ^N \j/ 



<-j&g*3 $" 



^WNfesSgg y VV\< 



Spirillum Finkleri. 700 diameters. (Flugge.) 



Stab Culture. (Finkler- 

 Prior.) 



cific action. If it is injected into Guinea pigs, prepared as 

 described under the cholera bacillus, they die, the intestines 

 having a foul odor, and the bacilli then found in great numbers. 



Spirillum Tyrogenum. (Deneke.) 



Origin. In 1885 Deneke found in old cheese a spirillum very 

 similar in appearance to the cholera spirillum. 



Form. The same as the cholera vibrio. 



