PLATE 16. 



Jjacillus mesentericus, Sewage variety (No. i.) (Houston.) 

 Film preparation from agar culture, 20 hours at 20 C. x 1000. 



Bacillus mesentericus, Sewage variety (No. i.) (Houston.) 

 Gelatine plate culture, 20 C. (Natural size.) 



[To face page 158. 



