PLATE ]6. 



liaciUus mescntenciis, Sewage variety (Xo. i.) (Huustoii.) 

 Film preparation from agar culture, '20 liours at l'0° C. :■' 1000. 



Uacilli'.s racsentcHcus, Sewayi:^ variety (Xu. i.) (Houston.) 

 Gelatine plate culture, i^O" C. (Natural size.) 



[To fdce 'poge 158. 



