CAUSE FOR VARIATION 



17 



Fig. 4 Large abscess in partially itrimutiized rabbit caused by swine- 

 plague bacteria. This rabbit lived sy I days after its inoculation with 

 virulent swine plague bacteria. At death its weight was igSo gratns, 

 the tumor itself weighing goo grams. The abscess Jormed dorsad of the 

 peritoneum, {a) Cecum, (b) intestines, (c) abscess. The control rab- 

 bit of same weight and age died of septicemia in 16 hours. 



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