PLATE 19. 



" < 



._.<. 

 ^ \ 



VA^,;:,^. 



ffyft 



\ 



. L* ^A\| 



*** ^ ;/ ~r 



* *4 ' / -^ 



V \ 



v / -^ 



X 



* ' 



C 



-&* 



I \^-^ 



S x O i 



X ^| XN N? 



iS^rsj 



^ . 



XV 



^ 



Bacillus diphtherice. 



Film preparation from serum culture, 24 hours at 37 C. 

 x 1000. 



*Ss9ra^-'wt ; ** 



5'^iFe'K*ei 



* .^^ i. * *> "'' _ j* d^ 4E _V\^w 



Bacillus von Hofmann. 



Film preparation from serum culture, 48 hours at 37 C. Roux's stain. 

 x 1000. 



[To face page 288. 



