STUDY OF THE IMMUNITY AGAINST BACILLUS PYOCYANEUS 1 3 



In neither of the four series in rabbits did less than -3 loopful kill 

 acutely irrespective of the number of passages. 



Guinea-pigs (intraperitoneal inoculation). 



Although the virulence of the cultures was considerably greater than 

 has been reported by most authors, it was found impossible to exalt the 

 virulence beyond certain limits. For the rabbit 0*3 of a loopful and 

 for the guinea-pigs 0*05 of a loopful were the smallest doses which 

 had lethal effects in spite of many passages. The pyocyanic bacillus 

 is therefore very different in this respect from microbes like pneumoccus 

 and streptococcus, and resembles bacteria like typhoid bacillus. 



Immunity against Bacillus Pyocyaneus. 



A large number of experiments were carried out on rabbits for 



(169) 



