Fig. III. Streptococcus. A pus- forming germ X 2000. 



■ ■■ J ■• -—■ ■•-— TTT?™ . -rr^ ,i^jjp«»i>«n«^^ 





i 



#** 



4M^ 





/" 



/ 



^ 







.r. 



Fig. IV. Anthrax Bacilli, that are being devoured by the white blood corpuscles of a frog. The frog is 



probably immune for this reason. X 400. 



(4§6) 



