248 Manual of Veterinary Microbiology. 



guinea pig. According to Straus and Gamaleia, avian 

 tuberculosis gives rise only to Yersin's septicsemic 

 type of the disease when it is inoculated in the veins 

 of the rabbit. 



The dog readily contracts human tuberculosis; it 

 does not take the tuberculosis of fowls. 



Fowls are refractory to human tuberculosis whilst 

 very sensitive to inoculations of avian tuberculosis. 

 The lesions become localized in the abdominal organs, 

 occasionally in the lungs, often also in the marrow of 

 bones (causing lameness). 



The question is whether or not these differences are 

 sufficiently important to justify us in regarding the 

 two bacilli as distinct species. 



Both bacilli have the same form ; the differences in 

 size which have been observed are of no importance ; 

 long bacilli may be seen in mammals and short bacilli 

 in fowls. Moreover, both are liable to vary in their 

 cultures and according to the animals to which they 

 are inoculated ; we have seen the bacilli of avian 

 tuberculosis become exceptionally short when inocu- 

 lated to the calf. 



Both bacilli behave alike toward coloring matters. 

 They produce lesions showing the same structure and 

 the same general evolution. 



The differential characters drawn from cultures are 

 not absolute. 



The inoculation of avian tuberculosis to the guinea 

 pig occasionally causes a generalization quite similar 

 to that regularly occasioned by human tuberculosis. 

 Out of twenty-seven guinea pigs inoculated with the 

 spontaneous lesions of the former disease five showed 

 a local abscess, seven a discrete visceral tuberculosis, 



