rv,/^ 



Fig. 63. a. Borrelia noviji. Peritrichous flagella of normal curvature. 

 Stained directly from mouse blood. 



b. B. vincentii. Peritrichous flagella of normal curvature. Stained directly 

 from material from the human mouth. 



a. From E. Leifson, /. Bacteriol. 60, 678-679 (1950). 



149 



