PLATE IV. 



lo. — B. Mesentericus. (x i.ooo.) 

 ;c variety I. Microscopic preparation 

 m by V. Ermengem's method, showing 

 11 )iis flagella. From a twenty hours' agar 



ti at 20" C. 



Fig II. — B. Mesentericus. (xiooo.) 

 Sewage variety E. Microscopic preparation 

 from a twenty hours' agar culture at 2.0'' C. 



Fig. 12.— B. SuBTiLissiMUS. ( x 1,000.) 

 Impression preparation from a gelatine plate culture. 



