PLATE VI. 

 Spirillum Finkleri. 



Comma-bacillus of Finkler and Prior. 



This figure represents the appearance of a plate-cultiva- 

 tion of the comma-bacillus from Cholera nostras, when 

 examined over a slab of blackened plate-glass. The 

 colonies differ very markedly from the colonies of 

 Koch's comma-bacilli (see Fig. 85). The drawing 

 was made from a typical result of thinning out or 

 attenuating* the colonies by the process of plate- 

 cultivation. At this stage they were completely 

 isolated one from the other ; but later they became 

 confluent and produced complete liquefaction of the 

 gelatine. 



* The term " attenuation" is applied also to a virus, in the sense 

 of weakening or modifying its effect. To avoid confusion the term 

 mitigation might be employed exclusively to express this, and 

 attenuation used only in the sense indicated above. 



