214 



swollen, hard and knotty. The tubercles are located in the 

 mucous membrane which lines the milk cavities and canals. 

 Abscesses of the udder are rarely tuberculous. 



It is possible to have a tuberculous abscess in the udder 

 when the lesions are very severe and extensive. Occasion- 

 ally the lymphatic glands in front and back of the udder 

 may become enlarged and tuberculous. 



(h). The bones are more frequently the seat of tubercu- 

 losis in swine than in cattle. The spongy centres of the 

 bodies of the vertebrae of swine may exhibit yellow tuber- 

 cles after the carcass has been cut into right and left halves. 

 The articulations and bones of the limbs in cattle are some- 

 times involved in tuberculous alteration. The articulations 

 are quite frequently involved in tuberculous calves. 



(i). The pharyngeal (throat) glands are more frequently 

 tuberculous than the udder or bones. The-^e glands lie just 

 back of the pharynix (throat) ; and when enlarged may 

 sometimes be observed before the death of the animal. At 

 first these glands are slightly enlarged and hard but later, 

 as the disease advances, they become large and soft, owing 

 to the extensive breaking down of tissue and the formation 

 of large cheesy masses. In some cases the post pharyiig il 

 glands are the only ones that are sufficiently involved by 

 tuberculous changes as to be visible to the naked eye upon 

 post mortem examination. 



(j). The Ijmphatic glands at the base of the ear, the 

 lymphatic glands on the inside of the lower jaw, the ingui- 

 nal lymphatics on either side of the scrotum in the male, 

 and on either side of the udder in the female, the lymphatic 

 glands above and in front of the stifle and those in front of 

 the shoulder blade may be the seat of tuberculous nodules 

 or tubercles. 



(k). The brain and spinal cord and the covering mem- 

 branes of each occasionally become tuberculous. 



(1). In extremely rare instances tubercles develop be- 

 tween the muscles. The muscle tissue proper does nf)t pre- 

 sent favorable canditions for the development of tubercles. 



