Immunity 487 



injection of the oidium, but usually only when it was combined 

 with pus cocci. In such abscesses the cocci are killed off by 

 phagocytes, and when cultures are made only the oi'dium 

 grows. Plaut points out that this is exactly the reverse of 

 what happens in artificial cultures of the two organisms 

 where the cocci outgrow and kill off the oidium. 



Intravenous injection sometimes causes generalized oidium 

 infection, with colonies of the micro-organism in the kidneys, 

 heart-muscle, peritoneum, liver, spleen, stomach, and in- 

 testines. The central nervous system may also show small 

 foci of the infection. 



Immunity. Roger* and Noissette f were able to immunize 

 animals against oidium. 



*"Compt.-rende de la Societe de Biologic," Paris, 1896. 

 t "These de Paris," 1898. 



