MICROSPIRA SCHUYLKTLLTENSIS. 489 



The pathogenic properties of this organism are best 

 seen in guinea-pigs and pigeons, both of which are uni- 

 formly susceptible. Rabbits and chickens resist rela- 

 tively large doses. Mice are infected with small doses 

 injected subcutaneously. 



The most characteristic lesions follow the injection of 

 cultures into the pectoral muscles of pigeons. At death 

 the inoculated muscle is swollen, necrotic, and the over- 

 lying tissues are oedematous. The bacteria are found in 

 large numbers in the vicinity of the seat of the inocula- 

 tion, and in relatively small numbers in the blood and 

 internal organs. 



