HOG-CHOLERA. 47 



ly, and gains slowly in flesh and strength ; a short, hacking cough 

 frequently continues for a long time. 



Pathological Phenomena. 



The morbid processes, though essentially the same, can have their 

 seat in many different organs or parts of the body. The necro- 

 scopical aspects of the disease are consequently not always the 

 same. 



We almost always find a more or less extensive infiltration of 

 portions of the lungs, as well as serous hemorrhagic conditions in 

 the pulmonary tissues. In some cases the infiltrated conditions of 

 the lungs are so extensive that they sink when thrown into water. 

 The degree of consolidation is largely de])endent upon the duration 

 of the disease. In some lungs these centers of consolidation were 

 circumscribed and rare, while in others they were diffuse, and com- 

 plicated a large portion of the lung. Where the consolidation was 

 limited, it was principally seated in the anterior lobes. In animals 

 where the disease had progressed slowly, the different stages, or bet- 

 ter conditions of consolidation were observable, conforming to the 

 red, brown, or gray hepatization of pathologists — conditions of color 

 dependent on the amount of blood present in the infiltrated pul- 

 monary tissues. The greater the endothelial proliferation, and accu- 

 mulation of inflammatory products, the greater the pressure exerted 

 upon the capillary loops dipping into the alveoli ; hence the variation 

 in color, red, brown, or gray. 



The lymphatic and mesenteric glands were invariably found to 

 be enlarged. In some cases they presented a brownish or blackish 

 color, and contained not only disintegrated elements but extravasa- 

 tions which lay between and separated the normal elements of the 

 glands. 



The trachea and bronchi were filled with more or less frothy 

 mucus, which contained desquamated epithelium and bacteria. The 

 mucous membrane was more or less tumefied and congested. 



Morbid changes were almost invariably present in the pleurae, 

 mediastinum, and pericardium, as well as slight effusions in the 

 cavities of the chest and abdomen. Pleural adhesions were fre- 

 quently met with, as well as deposits upon the free surface of the 

 membranes. 



The heart (myocardium) was found to be complicated in the 

 majority of cases. In some animals it was flabby and dilated, and 

 generally congested. In the majority of cases pathological changes, 

 which may be said to be pathognomonic, were found in the caecum 



