GENERAL ANATOMICAL CHARACTERS OF INFLUENZA. C7 



and textures such as is encountered in the second or third 

 stage, the red and grey hepatization of ordinary pneumonia ; 

 there is always a greater amount of serosity and httle well- 

 defined and fibrillated exudation. 



When manipulated, its parts fall or break up with greater 

 readiness under the same amount of force employed ; and often 

 when the cut surface is gently scraped with the knife, purulent- 

 looking fluid is gathered from the surface. The composition 

 of both this exudate and that contained in the cavities of the 

 pleural sacs is somewhat different from that which accom- 

 panies and is associated with common inflammatory action in 

 the same situation and textures. Occasionally the pulmonic 

 tissue, although changed, is so little solidified that its condition 

 may more correctly be termed carnification. Of a soft, doughy 

 feeling, the infiltrated material never takes on fibrillation, while 

 the colour of the lung itself in such cases partakes of a dull, 

 metallic hue, characteristic of humid gangrene, and it is em- 

 physematous. 



The thoracic surface of the diaphragm presents similar 

 appearances as to adhesions and colour with the costal pleura. 



The heart and containing membrane the pericardium, in the 

 great majority of cases of equine clistempev even of a mild 

 form, are evidently, even from the symptoms exhibited during 

 life, considerably involved ; while in such as terminate fatally, 

 where the thoracic features are dominant, the lesions of these 

 structures are quite decided. 



The pericardium may be simply heightened in colour from 

 the hypera^mic condition of its vessels, and its inner serous 

 membrane merely marked with ecchymosis or blood-spots 

 and contain in the pericardial sac a moderate amount of 

 serous fluid, or it may participate in the altered appearance 

 and condition of the pleural membranes being roughened with 

 floccuh of imperfectly organized lymph, and much thickened 

 in substance, containing a large amount of rather dark- 

 coloured serum, and marked with numerous blood-spots, 

 which seem as if pure blood had been effused in circumscribed 

 patches beneath the serous layer. 



The muscular tissue of the heart may be unaltered in appear- 

 ance. At other times it is somewhat blanched and softened, 

 presenting in many instances the same petechial spots or 



