66 PLANT DISEASE 



readily never possessed such a strong bacteri- 

 cidal action as the serum of white rats which 

 are immune. . . . Dr. Buchner ascribes immunity 

 to proteid substances. . . .Wild rats, fed on plain 

 bread for about six weeks succumbed to an- 

 thrax with which they were inoculated, others 

 fed on flesh did not take it, and their spleens 

 were found to contain an abundance of the 

 proteids." 



On page 396 Prof. Emmerich, of Munich, 

 stated 



"That his previous experiments on swine 

 fever had proved that in immune animals the 

 bacilli of swine fever were destroyed not by the 

 cells of the animals, but by a bactericidal sub- 

 stance present in the blood. The bacilli were 

 destroyed almost immediately after their intro- 

 duction under an immune animal's skin." 



On page 398 he says 



"Dr. Klein observed that frogs and rats were 

 insusceptible to anthrax, but that they could be 

 made susceptible by various means, indicating 

 that their normal resistance was due to certain 

 chemical conditions of the blood." 



Bacteria, by Geo. Newman, M.D., F.R.S., 



