B C 



Fig. 26. A, cholera bacteria in the blood of guinea pigs after infec- 

 tion of the small intestine. (From photograph by van Ermen- 

 ; ghem) i : 700. 



B, and C, The Spirochaete of relapsing fever (after photo- 

 graphs), B, I : 700 ; C, I : IOOO. 



