Tuberculosis. 437 



Tubercle of Lymph Glands. No organs in the body suffer 

 more than the lymph glands as they receive through their affer- 

 ent trunks and develop the bacilli coming from any adjacent tis- 

 sue to which they are subsidiary. There is also evidence to show 

 that bacilli entering from the lungs or bowels may pass through 

 these without apparent effect to develop in the connected lymph 

 glands. The frequent infection of the pharangeal, bronchial, 

 mediastinal and mesenteric lymph glands has been already suffi- 

 ciently noticed, and if the other groups suffer less it is mainly 

 because the tissues from which they derive their lymph are less 

 frequently infected. An intimate knowledge of the different 

 groups of lymph glands is a most essential prerequisite to the 

 diagnosis of tuberculosis in life, and no less to a satisfactory post 

 mortem examination. The order of relative susceptibility and 

 importance is somewhat as follows : Bronchial, mediastinal, 

 mesenteric, hepatic, sub-lumbar, mammary inguinal, sub-dorsal, 

 phrenic, intercostal (especially the first and second), pharyngeal, 

 parotid, sub-maxillary, prescapular, prefemoral (stifle), prepec- 

 toral, axillary, cubital and popliteal. 



Relative Frequency of Tubercle in Different Parts in Cattle. 

 The following table gives the seat of tubercle as noted by a num- 

 ber of observers. It is open to the objection that it is the result 

 of examination for diagnosis, and therefore gives the most obvi- 

 ous rather than the complete list of lesions. Examination of the 

 brain, bones, deep muscles and intermuscular glands, etc., was 

 usually omitted. Again, as the animals were often steers, the in- 

 dications as regards the generative organs are unreliable. The 

 cesophagostoma nodules on the bowels have been so often mis- 

 taken for tubercles that I have omitted all reference to intestinal 

 tubercle. 



