Tuberculosis. 483 



Swine. The lesions in swine, though essentially like those in 

 cattle, differ in some particulars. The primary tubercles are 

 more commonly pharyngeal or intestinal and mesenteric, in keep- 

 ing with infection by ingestion ; caseation will often proceed to 

 liquefaction, so that the tubercles appear like grumous abscesses 

 with irregular outlines and vascular growths on their walls ; 

 there is less tendency to cretef action than in cattle ; the muscular 

 and intermuscular tissues and the lymph glands are far more 

 frequently affected ; ulceration of the pharyngeal and intestinal 

 mucosae is more common. The lungs, liver, spleen and visceral 

 lymph glands are very subject to tubercle, the kidneys, uterus 

 and testicles somewhat less so, and the nerve centres least of all. 

 The serosse are often involved and the seat of clusters of vascular 

 or caseated neoplasms (grapes). The bones and joints also 

 suffer, particularly in young growing animals. 



Horse. The horse suffers much less frequently than cattle or 

 swine, probably largerly because of his outdoor life, his better 

 tone as the result of muscular work, and the absence of the ex- 

 cessive milk secretion which is secured from cows and of the 

 dangers from ingestion that attend on swine. Yet according to 

 Nocard, it is even more susceptible, and the disease once estab- 

 lished is liable to advance more rapidly to a diffuse generaliza- 

 tion. The lesions in the lungs and abdominal cavity resemble 

 those of cattle, both in nature and abundance ; tuberculous polypi 

 and ulcers are more common ; the visceral lymph glands (bron- 

 chial and mesenteric) are early and severely attacked ; the liver 

 and spleen suffer extensively, the serosse somewhat less so ; 

 lesions have been noted in the vertebrae, skin and muscles 

 (Cadiot). In rare instances tubercles have been seen in the 

 heart, and the aorta has been atheromatous (Cadiot). Necrotic 

 degeneration, caseation and cretefaction occur as in cattle. 



Sheep and Goat. Tuberculosis is infrequent in the goat and 

 especially so in the sheep, owing perhaps largely to open air life and 

 their predilection for high, airy pastures. When inoculated they 

 show a marked susceptibility, and under favorable conditions they 

 contract the infection casually. The tubercles may be found in 

 all parts of the body, — lungs, thoracic lymph glands, intestines, 

 mesenteric* and sublumbar glands, liver, spleen, serosae, lymph 

 glands at large, vertebrae, etc. There is less tendency to calci- 



