llicrobic Diseases Individually Considered. 247 



applicable to the scrofulo-tuberculosis of the pig 

 (j^ocard). 



MM. Courmont and Dor have succeeded in produc- 

 ing local articular tuberculosis in the rabbit by intra- 

 vascular inoculation of attenuated bacilli; one or 

 several articulations were attacked, whilst the viscera 

 remained unaffected. 



Tuberculosis of mammals and avian tuhercidosis. — 

 The question as to the identity of these diseases has 

 given rise to much discussion. "We will describe first 

 of all their differential characters : 



The bacillus of avian tuberculosis is longer than 

 that of the disease in mammals. 



It grows on the different media when taken di- 

 rectly from the diseased animal, that of the mamma- 

 lian disease only, in a satisfactory "^nianner, after 

 several transfers upon serum. 



The vegetation of the bacilli of fowls is more rapid ; 

 their cultures on solid media are thick, moist and 

 luxuriant; those of the bacillus of man are meager, 

 dry, scaly and of dull appearance. 



Cultures derived from fowls preserve their vitality 

 longer (ten months at least) than those coming from 

 man (six months). 



The avian bacillus grows at a temperature as high 

 as 43°; that of man ceases to grow at 41°. 



Avian tuberculosis is with difficulty transmitted to 

 the guinea pig and the lesions do not become gener- 

 alized as in that which is derived from the human 

 being. 



The rabbit, although no more sensitive to the 

 tuberculosis of fowls than to that of mammals, shows 

 a much great susceptibility to the former than the 



