IN SUSCEPTIBLE ANIMALS. 527 



is viscid, drawing out into threads. In the absence of oxygen the characters 

 of growth are the same as in its presence. The cultures acquire an alkaline 

 reaction ; they are sterilized by exposure for ten minutes to a temperature of 

 60 C. Does not grow upon potato. 



Pathogenesis. Pathogenic for chickens and turkeys. Not pathogenic for 

 pigeons, guinea-pigs, or rabbits when injected subcutaiieously or into the 

 peritoneal cavity, but kills rabbits when injected into a vein. In the in- 

 fected fowls the bacilli are found in small numbers in the blood, more nu- 

 merous in the kidneys and liver, still- more numerous in the spleen, and in 

 enormous numbers in the intestinal mucus, where in acute cases it is found 

 almost in a pure culture. Fowls do not contract the disease as a result of 

 the ingestioii of grains soiled with cultures of the bacillus, but become in- 

 fected when fed with animal food to which a pure culture has been added. 



