80 EXPERIMENTAL RESEARCHES 



tective and defensive nature. Thus we have 

 shown that bacteria congregate in those parts 

 where they find the most favourable conditions 

 of nutrition, whilst the organism, both by its 

 phagocytes and by means of encystment, endea- 

 vours to render the pathogenic germs harmless 

 and to eliminate them. You see, therefore, that 

 this is a war waged in different fields, but in 

 which to every action there corresponds a 

 reaction. The war is waged in a three-fold 

 manner by variations of affinity, by variations 

 in the poison, and by localisation. 



