THE MICROBES OF HUMAN DISEASES. 



203 



FeiTan regards this peronospora as the infectious 

 agent of cholera. Yet it seems extraordinary that 

 such a remarkable polymorphism should have escaped 

 the observation of Koch and of the numerous micro- 



Figs. 88, 89, 90. Evolution of cholera microbe {Peronnspora Ferrani: FerraiO: 

 1. Cholera microbe (/iacillus komma), discovered by Koch. 2. Spiral form of 

 bacillus, transferred from gelatine to an infusion. 3. Degeneration of sjmal 

 form after a srri.-s .!' successive cultures. 4. Cholera microbe (/Vrow>.;x//-a 

 Arrant): development of oogonium on the spirilla and straight filain. nts. 

 5. The oogonium is filled with granules which centre in a point k, and it is then 

 converted into an oosphere ; m, pollinidium on fertili/ing oigan. 6. The oosphere 

 is converted into mulberry-shaped and comma-shaped bodies. 



graphists who have made various cultures of the 

 comma bacillus. It is difficult not to suppose that 

 some negligence or error has vitiated Ferran's re- 



