Fig. 7. — B. ivbtilimmus. Impression preparation from a gelatine plate 

 culture x J 0< M). 



77 Sf- 



> *.1 - ,;■ XT 



],],;. s.— B. mesentericus. Sewage variety E. Microscopic preparation from a 

 20 hours' agar culture at 2(1° C. x 1000. 



