PATHOLOGICAL RESULTS, ETC. 341 



which showed no local lesion of the intestine, is of great 

 interest, as showing that when the material was non-virulent 

 the bacilli could pass through the mesenteric glands without 

 producing a local lesion. This point is further emphasised 

 by the experiments on pigs. 



Pigs are the subject of natural tuberculosis, which is, in 

 the great majority of instances, due to the eating of tuber- 

 culous material. As an example of natural tuberculosis of 

 a severe type resulting from the ingestion of tuberculous 

 material the following case may be quoted. There 

 was a large tuberculous ulcer of the right tonsil and 

 tuberculosis of the corresponding lymphatic gland be- 

 low the jaw ; this was connected with a chain of tuber- 

 culous glands on the right side of the neck. There were 

 several recent tubercular ulcers in the caecum, but none in 

 the intestines, and the caecal and mesenteric glands were 

 extensively tuberculous. The cceliac glands were also 

 affected, and those in the lesser omentum ; the liver 

 and spleen showed caseous tuberculosis. The posterior 

 mediastinal and bronchial glands were also affected 

 by the disease, and there was acute caseous miliary 

 tuberculosis of the lungs, with tuberculous pleurisy and 

 effusion of clear liquid on both sides. In this case it is 

 evident that the sites of infection were at the right tonsil 

 and in the caecum. In the pig the tonsils are frequently a 

 channel of infection of tuberculosis. From the tonsil the 

 disease spread to the neighbouring lymphatic glands, and 

 down the chain of cervical glands to the glands in the 

 thorax ; thence to the lurigs, and from the caecum the 

 disease spread to the mesenteric glands, the cceliac and the 

 glands of the lesser omentum, and the liver and spleen. 



As far as could be judged, this pig had been infected 

 about eighty days before it was slaughtered. 



A second case of tuberculosis in the pig, resulting from 

 feeding with virulent tuberculous material, may be quoted. 

 A healthy pig was fed with 1 20 grammes of bovine tuber- 

 culous material, and was killed in fifty-seven da)S. There 

 was found one tuberculous ulcer in the small intestine, 

 which measured one-quarter of an inch by one-half. Several 



