60 Veterinary Medicine. 



exudate may extend from the root of the lungs, through the in- 

 tercostal spaces to the skin in the breast, the axilla and behind. 

 The tongue is often enormously swollen and black, charged with 

 extensive blood extravasations in addition to the yellowish exu- 

 date. Along its sides and on its lower surface, the mucosa stands 

 out in projecting masses of yellowish infiltration, which may show 

 equally on the fauces, pharynx, larynx, trachea and bronchi. 



In the lungs the pleurae and subpleural and interlobular tissue 

 are extensively infiltrated and thickened by a profuse yellowish 

 serous or sero-sanguineous exudate, so that the appearance may 

 closely resemble that of lung plague. The lung tissue is consoli- 

 dated, hepatized and dark red, with at some points emphysema. 

 The pleural sac is usually filled by a serous or bloody effusion 

 (2 to 25 quarts) and there is often extensive implication of the 

 pericardium. The tracheo-bronchial mucosa and bronchial glands 

 show extensive infiltration and thickening. 



In the abdome?i are found extensive infiltrations and blood 

 extravasations in the mucosa and submucosa of the stomachs and 

 intestines, softening and shedding of the epithelium, infiltrations 

 of the peritoneum, diaphragm, and sublumbar adipose tissue, and 

 softening and degeneration of the liver and kidneys. The intes- 

 tinal gastric and mesenteric glands are usually infiltrated softened 

 and bloodstained. Engorgement of the spleen is exceptional. 



The blood is very black but not usually materially changed in 

 consistency nor coagulability. Petechiation of the different 

 serosas and other tissues is a prominent feature. 



In chronic cases the lesions are mostly shown in the lungs and 

 lymph glands. The lungs show circumscribed lobular islets of 

 congestion, induration or caseation, offering a suggestion of 

 tubercle, which is all the more deceptive when cretifactiou has 

 set in. The caseous centres may vary in size from a pea to a 

 walnut, and some may have ruptured to form a vomica discharg- 

 ing into a bronchium. Bronchia leading to affected lobules are 

 blocked with mucopurulent matter, yellowish, thick and tenacious, 

 and their mucosa is thickened and puckered. The enlarged 

 lymph glands are especially those of the bronchia, trachea, medi- 

 astinum, bowels, mesentery and sublumbar region. 



The bacillus is present in the exudate but is especially abund- 

 ant in the blood, and in the chronic cases in the bronchial mucous. 



