SPIRILLUM AVICIDUM 85 



organism, 'but the liquefaction proceeds so much 

 more rapidly that by the time the characteristic 

 growth of Sp. Cholerse is reached, the Sp. Finkleri 

 has produced a long finger-shaped track in the 

 gelatine, in which all trace of the original funnel 

 has been lost. Comparison of the four photographs 

 and of the periods of growth of the cultures they 

 represent shows at once the nature of the differen- 

 tiation (Figs. 84 and 85). 



The pathogenicity of this microbe is much less 

 than that of cholera. 



The Spirillum Avicidum, or Sp. Metchnikovii, is an 

 organism discovered by Gamaleia in the intestines 

 of domestic fowls, and presents a very striking 

 resemblance, both morphologically and culturally, to 

 the organism of Koch. In preparations made from 

 the infected animal or from pure cultures no con- 

 stant differences between the two organisms can be 

 detected, though the Sp. Metchnikovii is perhaps 

 generally thicker and shorter. The arrangement 

 and number of flagella is also identical (Fig. 87). 



The two illustrations of the growth in gelatine 

 might very well pass for growths of the Cholera 

 Spirillum, though as a general rule the growth of 

 the Sp. Avicidum is somewhat the more rapid 

 (Figs. 88 and 89). 



