88 SMALL-POX IN SHEEP. 



in tlie mucous membranes of tlie aUmentarij canal; 

 but, speaking of the post-morfe?n a})pearances, he 

 states that the I'Dinig membrane of tlie trachea is mar- 

 bled in spots, jnifque/fse marhr^e de taches, which differ 

 in colour* : are they analagous to mucous vari? These 

 lesions are not simply confined to the nasal portion of 

 the respiratory system, but extend into the larynx, 

 trachea, and bronchi : see fig. 2,j)late 4. 



Occasionally small ulcers are situated on the epiglottis 

 and other parts of the larynx, and along the course of the 

 mucous membrane ; rarely, however, do they extend as 

 far as the bronchi. The smaller bronchial tubes and air- 

 cells of the lungs are mostly filled with dark coloured 

 mucus, and are, in general, less engorged with blood 

 than the other portions of the air-passages. The 

 serous membranes of the thorax are comparatively free 

 from disease : we have seen them, however, very much 

 inflamed ; and in one instance the greater part of the 

 surface of both lungs was adherent to the sides of the 

 chest by a thick layer of colourless fibrin : the lobes of 

 these organs were, in like manner, glued together ; the 

 outer portion of the pericardium was coated with lymph ; 

 the heart was inflamed and partially united to its sac 

 by bands of fibrin ; an effusion of serous fluid also exist- 

 ed in the pericardial and thoracic cavities. Such appear- 

 ances are unfrequent, and in general the lungs are con- 

 gested, and liver-coloured spots, irregular both in size 

 and form, are seen immediately beneath their pleural 

 covering. The digestive system shews fewer traces of 

 morbid action ; the buccal membrane and the velum 

 palati are sometimes inflamed, but we have not ob- 



* Art. ClaveJee, p. 471. 



