PLATE 15. 



.y 



x 



\ 



V .^• 



,J 



N 



K, 





Sewage Streptococcus, from Eftlnent. (Houston.) 



From brotli culture, ^8 hours at 3S' C. Wtained by 

 Gram's method. \ IGOO, 



Str'j'tococcus jyyogenes. 



Film culture Irotu broth culture. Stained by Gram's 

 method, x 1000. 



\ 



V 



\ 



Sewage Streptococcus, fruin Crude Sewa^;'^. (Iluuston.) 



From broth culture, 48 hours at '6'6' C. Stained by Gram's method. 

 X 1000. 



[To face po/jc 156. 



