Chronic Fibrous Pneumonia. Pulmonary Sclerosis. 317 



connective tissue, is in part deposited, mapping out these spaces 

 as dark lines : a part proceeds along the lymph vessels to the 

 lymph glands which filter out enough to give them a dark pig- 

 mentation ; finally, a small amount reaches the thoracic duct, and 

 veins and is finally deposited in the liver and spleen. In the 

 case of the strongylus vasorura the sclerosis is primarily concen- 

 trated around the bronchia and larger pulmonary blood vessels. 

 It is no uncommon thing to find around the infested bronchia, 

 nodules consisting mainly of embryonal cells, in the midst of 

 which are the ova and embryos of the strongle. When the 

 strongles have passed the larval stage and migrated into the 

 vessels, these nodules remain as fibroid masses, and the degen- 

 eration may extend into the adjacent lung. 



Lesions. These are largely like those of solipeds. The sites 

 and extensions of the fibrous formations show the nature of the 

 primary lesions, and in the case of anthracnosis the pigmentation 

 of the lung and especially of the connective tissue is significant. 

 This pigmented condition must not, however, be inferred from 

 the small amount of black pigment found on the surface of the 

 healthy lung in the dog. 



Symptoms. These vary according to the grade and extent of 

 the fibroid degeneration. In advanced cases, though the tem- 

 perature is normal, the difficulty of breathing is extreme or is 

 roused by the slightest exertion. It is accompanied by an irri- 

 tating cough occurring in paroxysms and often followed by vom- 

 iting. Wheezing and sibilant sounds or blowing rales are heard 

 in the lungs, and percussion shows a loss of resonance (even com- 

 plete flatness) over given areas, There is increasing emaciation 

 and the dog is practically useless. Imperfect cardiac valves may 

 be detected. 



Treatment. This would be only hopeful in the line of prophy- 

 laxis, obviating the sclerosis by successful treatment of the 

 earlier and causative lesions. This would be undertaken along 

 the same general lines as in the horse. In advanced conditions 

 it becomes at once merciful and economical to do away with the 

 animal. 



