426 DISEASES OP CATTLE. 



the swelling measured S£ by 5 inches, and the corresponding lymph 

 gland was 2f inches long by if inches in diameter. This gland con- 

 tained numerous calcareous foci; one of these at the apex was an 

 inch in diameter. The lesions on the left shoulder of the animal were 

 very similar to those found on the right side, but the dimensions of 

 the tumor were slightly less. The lungs presented an irregular mass 

 of tubercular nodules, and 7 or 8 grape-like nodules were seen on the 

 parietal pleura. Bronchial and mediastinal lymph glands contained 



TUBERCULOSIS. 



[Description of plates.] 



Plate XXXIV. Tuberculosis of the lungs. The upper figures represent a large 

 cheesy mass, surrounded by a capsule of connective tissue, the whol3 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. 



Plate 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 tuber- 

 culous degeneration. This large mass involves the surface of the liver, and also 

 extends into the liver substance. 



Plate XXXVI. A lymph gland from the region of the thorax behind cr above 

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

 cut through and laid open. It is very much enlarged, and the yellowish cheesy 

 masses which represent tissue undergoing tuberculous changes are well shown on 

 the cut surface. 



Plate XXXVII. Represents the omentum, or caul, of a tuberculous cow. The 

 preparation had been in alcohol for some time. The projecting masses are the 

 tubercles, whence the name ''pearly disease" for that form of the malady in 

 which these tubercles are present. They are mainly restricted to the lining 

 membrane of the thorax and abdomen. 



Plate XXXVIII. Fig. 1. Lymphatic gland of the mesentery (the fold of mem- 

 brane to which the small intestines are attached) cut open. The gland is very 

 much enlarged. The yellowish portions represent tissue which has undergone 

 tuberculous changes. 



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. Both 

 specimens are from the same animal, a Jersey cow. 



Plate XXXIX. Fig. 1. Tuberculosis of the sirloin and porterhouse cuts of beef. 

 The grape-like tuberculous growths are mainly restricted to the lining membrane 

 of the abdomen. 



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

 the grape-like clusters of tubercular nodules scattered over the lining membrane 

 of the chest (pleura) . 



Plate XL. Tuberculosis of a cow's udder which appeared uniformly swollen 

 and quite firm. Small cheesy foci and yellowish lines of tuberculous material 

 follow the course of the milk ducts. The mucous membrane cf the milk cistern 

 ( a ) is ulcerated and covered with yellowish cheesy particles. The supramammary 

 lymphatic gland (5) is greatly enlarged and contains many miliary tubercular 

 foci. 



