MORBID ANATOMY I49 



quantit}- of minute translucent, gray granulations, caused by 

 generalizatiou through the blood stream, in which case the 

 liver, the spleen, the kidneys, the medulla of the bones, and 

 the mammae are usually infiltrated with similar growths. 



It is common to find lesions localized in one or several 

 lymphatic glands. The tonsils and the pharyngeal or sub- 

 maxillary glands are the ones most often affected. They be- 

 come voluminous, hard and knotty, as they have undergone 

 a true fibrous transformation and, consequently, difficult to cut. 

 This is shown by the tissues creaking under the cutting in- 

 strument. In section they have the appearance of old fibrous 

 tissue ; here and there small yellow foci are seen of a softer 

 consistency, almost caseous ; sometimes veritable purulent col- 

 lections are found, either encysted or in communication with 

 the exterior. If one submits the caseous or purulent matter to 

 a bacteriological examination, tubercle bacteria are not usually 

 found. The bacterium, however, is present and if this matter 

 is inoculated into the peritoneal cavity or the cellular tissue of 

 guinea pigs it will produce tuberculosis. 



These chronic glandular lesions, with their very slow pro- 

 gress, have long been looked upon as constituting the scrofula 

 of swine, and to scrofula was also assigned the tuberculous 

 lesions of bones (ribs, vertebrae, articulations, shoulder blades, 

 hip bones, etc.) which are common in pigs, both young and old. 



The older authors noted that the ancient scrofula was often 

 accompanied by visceral tuberculosis, but they refused to admit 

 the identity and even the relationship of the two affections. 



The generalization of the disease especially in the mus- 

 cular tissue is reported by several observers. Moule calls at- 

 tention to this peculiarity of the disease. vStockman shows 

 that while the disease is ordinarily generalized, muscular le- 

 sions may exist in swine in the absence of generalization. 

 Zschokke has called special attention to the localization of 

 tubercular lesions in the head of swine, especially in the nares 

 and brain. 



Tuberculosis in the horse is rare although a total of many 

 cases has been reported. Bang has collected twenty-nine cases. 

 In Saxony .08 per cent of the horses (3,500) that were slaugh- 



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