xiv] 



BACILLUS TUBERCULOSIS 



337 



If the disease is allowed to run its course, the animal be- 

 comes greatly emaciated and dies in about four 'to five 

 months or later, and then we find tubercles in all lymph 

 glands, in the viscera, and in the marrow of bone and 

 serous membranes, but the changes in the abdominal viscera 

 are the most extensive, those of the thorax considerably 

 less. 



Fig. 130. — Film Specimen of Human PuLMONARvTuBERCLii-SpUTUM. Numerous 

 LONG Tubercle Bacilli with Segregated Protoplasm. (A. Pringle.) 



In the rabbit, on the other hand, feeding with human 

 tubercular matter produces considerably less result ; in a 

 large percentage of cases, even after many weeks, caseous 

 tubercles are found only in the lower ileum and mesenteric 

 glands, the spleen, liver, and lungs appear free, only in a 

 few cases are also these organs involved but to a small 

 degree, viz., containing only few tubercles. 



In the fowl, both by subcutaneous inoculation and by 



z 



