Microbic Diseases Individually Considered. 233 



rise to engorgement of the corresponding lym- 

 phatic glands. The local lesion is less pronounced 

 than in the guinea pig, and generalization, less con- 

 stant, occurs through the intermediation of the blood ; 

 the changes, here, are found chiefly in the lung. 

 With bovine tuberculosis, in certain cases in the rab- 

 bit, M. Arloing has seen the development of glandular 

 lesions resembling those of the guinea pig. 



lutra-peritoneal inoculation in the rabbit and guinea 

 pig determines tubercular lesions of the peritoneum, 

 epiploic glands, liver, and spleen. The duration of 

 the disease is always shorter than by the subcutaneous 

 method. 



Intra-vascular inoculation produces a generalized 

 tuberculosis, but death is so rapid (fifteen to twenty 

 days) that the specific lesions are not visible to the 

 naked eye. The bacilli are disseminated throughout all 

 the parenchymatous organs (septictemic type, Yersin). 



According to Straus and Gamaleia this tuberculous 

 septicfemia is obtained only with the cultures of avian 

 tuberculosis. 



Diagnosis of doubffid cases in cattle. — In cattle the 

 -diagnosis of tuberculosis by means of the clinical 

 s^'mptoms is often difficult. ISTot to speak of abdom- 

 inal forms which are still more difficult of recognition, 

 the discharge from the nostrils is often absent in pul- 

 monarv tuberculosis, and the search for the essential 

 element — the bacillus — consequently denied to us. 



M. ISTocard, basing himself on the fact that cattle 

 are accustomed to swallow their expectorations, ad- 

 vises looking for the bacillus in the pharyngeal mu- 

 cus; this can be obtained by scraping the mucous 

 20 



