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BOVINE PATHOLOGY. 



thickened, opaque, and varying in colour in different parts. 

 The pericardium is also involved ; the intercostal muscles 

 are darkened. The lungs are the main seat of disease ; 

 sometimes only one of them (generally the right) is affected, 

 and there is disease of only one pleura (see Fig. 23). 



Fio. 23. — Pleuro-pneumonia zymotica. Elglifc lung affected, c. Interlobu- 

 lar bands, d. Lobules. (Simonds.) 



A distinctive peculiarity of the lesions of the lungs 

 is their circumscribed character, whereby a diseased 

 portion exhibiting very marked changes may lie against 

 a piece which is either but little affected or even healthy. 

 Hence results the well-known mottled condition of the 



