Broncho- Pneumonia from Inhalation. 307 



trains), or in hunting. Thus, Lechre found the thorn of a 

 bramble in the centre of a pulmonary phlegmonous abscess which 

 burst into the pleura with fatal results, and Weber, a spike of 

 rye as the central factor in capillary bronchitis. 



Lesions. These are found in the same order as in the horse. 

 In very recent cases they may be mainly those of capillary bron- 

 chitis with the foreign bodies embedded in the exudate in the bron- 

 chioles. There may be collapse of lobulettes of lung connected 

 with the inflamed and blocked bronchioles, such portions ap- 

 pearing depressed but red, consolidated and sinking in water. 

 The affected bronchia are filled with a muco-purulent exudate 

 containing many leucocytes, pus cells and detached and swollen 

 epithelium. In cases of active septic fermentation, this exudate 

 may be largely a thin incoagalable serum with more extensive 

 infiltration of the coats of the bronchia, and of the peribronchial 

 connective tissue. When the morbid process has extended to 

 the alveoli and lung tissue, the air sacs are distended with the 

 same serous fluid and the whole lobule is infiltrated so that it 

 projects on the surface of the lung beyond other parts, and as 

 numerous lobulettes are affected these stand out as bosses, of a 

 red, brownish red, dark red, black, or grayish color. Still later 

 the clusters of alveoli are liable to form purulent .centres. 



The exudate may be confined to the vicinity of the terminal 

 bronchiole forming a firm nodule without the implication of the 

 entire lobulette until later. On section, these have a granular 

 appearance due to the abundance of cell organisms, — red cells, 

 leucocytes, pus cells, and swollen epithelial cells. This central 

 nucleus is surrounded by a zone of splenization, of violet color 

 and homogeneous structure but which is progressively invaded by 

 the central granular gray nucleus. Multiple minute abscesses 

 and vacuoles are found in advanced cases. 



CEdema of the lung is not uncommon, and emphysema is also 

 a frequent result of the violent paroxysms of coughing. Again 

 the invasion of the pulmonary parenchyma may extend to the 

 pleura, or abscess may burst into the pleural sac causing a gen- 

 eral infective pleuritis. 



In all cases the exudate in the bronchioles, their walls, the air 

 sacs and cells, the pulmonary tissue and the pleura, contain 

 abundance of bacteria of different kinds. 



