TUBERCULOSIS. 



DESCRIPTION OF PLATES. 



Plate XXXIV. Tuberculosis of the lungs of cattle. The upper figure represents 

 a large cheesy mass, surrouudetl by a capsule of connective tissue, the 

 whole embedded in healthy lung tissue. The lower figure illustrates in 

 section a mass of tubercles which have undergone cheesy degeneration, 

 and some of which are surrounded by dense connective tissue. 



Plats XXXV. Tuberculosis of the liver. A large portion of the lobe repre- 

 sented in the plate has undergone tuberculous changes. Numerous 

 nodules are shown in various stages of the disease, the majority of 

 which, however, contain the yellowish, partly cheesy, partly gritty 

 areas characteristic of advanced tuberculous degeneration. This large 

 mass involves the surface of the liver, and also extends into the liver 

 substance. 



Plate XXXVI. Tuberculosis of lymph gland and of omentum (caul). 



Fig. 1. A lymph gland from the region of the thorax behind or above the 

 esophagus, or gullet (posterior, or dorsal, mediastinum). The gland is 

 shown cut through and laid open. It is very much enlargetl, and the 

 yellowish cheesy masses which represent tissue undergoing tuberculous 

 changes are well shown on the cut surface. 

 Fig. 2. Omentum, or caul, resting upon the paunch. The reddish 'nodules 

 with which the membrane is beset are tubercles, the product of the 

 disease. 



Plate XXXVII. Fig. 1. Tuberculosis of the sirloin and porterhouse cuts of 

 beef. The grapelike tuberculous growths are mainly restricted to the 

 lining membrane of the abdomen. 

 Fig. 2. Tuberculosis of the pleura of a cow, so-called " pearly disease." 

 Notice the grapelike clusters of tubercular nodules scattered over the 

 lining membrane of the chest (pleura). 



Plate XXXVIII. Tuberculosis of cow's udder. The udder was uniformly 

 swollen and quite firm. Small cheesy foci and yellowish lines of 

 tuberculous material follow the course of the milk ducts. The mucous 

 membrane of the milk cistern (a) is ulcerated and covered witli 

 yellowish cheesy particles. The supramammary lymphatic gland (b) 

 is greatly enlarged and contains many miliary tubercular foci. 

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