PLATE 21, 



& 



; 



/ 







teritidia sporogenes. (Klein.) 

 Film preparation from serum culture, showing spores. X 2000. 



ANAEROBIC MILK CULTURE, SHOWING THE " ENTERITIDIS CHANCE.' (Klein.) 

 From left to right, tubes contain ,>,, ,}, ,J,,, ,} c.c. ot Nottingham crude sewage. 



[To face page 307. 



