Immunity against pathogenic micro-organisms 155 



fact has been brought forward to invalidate the results there set 

 forth. 



Fio. 23. Macrophage containing 

 bacilli, from the liver of a rat 

 affected with anthrax. 



FIG. 22. Macrophage 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. Microphage of rat 

 filled with bacilli. 



Fio. 25. Two micro- 

 phages of rat that 

 have ingested bacilli. 



