PATHOGENIC BACTERIA. 



113 



Potato. At ordinary temperature a FlG> 61- 



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- 

 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. (Den eke.) 



Origin. In 1885 Deneke found in old 

 cheese a spirillum very similar in appear- 

 ance to the cholera spirillum. 



Form. The same as the cholera vibrio. 



Properties. Very motile, liquefy gela- 

 tine. 



Growth. They grow quicker than the 

 cholera, and slower than the Tinkler; 

 they are also facultative aerobic. 



Colonies. They at first resemble cholera 

 colonies ; they have, however, a yellow- 

 green iridescence, and are somewhat more irregular ; also grow 

 more rapidly. 



Stab Cultures. A thick line along the needle-track and the 

 yellow colonies forming at the bottom, on the surface a bubble 

 of air similar to the cholera. The gelatine is all liquid in two 

 weeks. 



Potato. At brood-heat a thin yellow membrane, but not 

 always constant. 



Staining, as cholera bacillus. 



Pathogenesis. When injected into animals prepared as for the 

 cholera bacillus, a certain number die. 



Vibrio Metschnikovi. (Gamaleia.) 



Origin. In the intestines of fowls suffering from a gastro- 

 enteritis, common in Eussia. Gamaleia found a spirillum which 

 bears so close a resemblance to the cholera bacillus, both in form 



Stab Culture. (Finkler- 

 Prior.) 



