Fig. :». — B. mesentericus. Sewage variety E. Microscopic preparation stained 

 by V. Ermengem's method, showing numerous flagella, from a 20 hours' 

 agar culture at 20° C. x 1000. 



Fig. 1. — B. mesentericus. Sewage variety I. Microscopic preparation stained 

 by V. Ermengem's method, showing numerous flagella ; from a 20 hours' 

 agar culture at 20° C. x 1000. 



