Immunity against pathogenic micro-organisms 155 

 ict has been brought forward to invalidate the results there set 



Fig. 22. Macrophage from the liver of 

 a rat affected with anthrax. 



Fig. 23. Macrophage containing 

 bacilli, from the liver of a rat 

 affected with anthrax. 



How is this paradoxical fact to be explained, that anthrax which 

 grows in the body of the rat, there setting up a disease more or less 

 grave and sometimes fatal, is so readily destroyed by the serum and 



Fig. 24. Mierophage of rat 

 filled with bacilli. 



Fig. 25. Two micro- 

 phages of rat that 

 have ingested bacilli. 



