620 SPORADIC DISEASES. 



Metastatic or embolic broncho-pneumonia results as a sequel 

 to septic metritis, absorption of products from septic wounds, or 

 from impure drinking water or tainted food. 



CHRONIC BRONCHITIS, 



As indicated by a loud, metallic cough, emaciation and debility, 

 is not an infrequent disease, particularly in horned cattle, and is 

 due to tliickening of the bronchial and alveolar walls, and to 

 caseous masses. It is best treated by hydrocyanic acid, in doses 

 varying from TI[ xx. to TT[ Ix., Scheele's strength, in combination 

 with nitrate of potash and bicarbonate of soda, twice per day, a 

 strong blister to the breast, and careful housing and nursing. 

 A morbid change, termed bronchiectasis or dilatation of the 

 bronchial tubes, arising from a chronic interstitial pneumonia, 

 induced by acute croupous pneumonia, broncho-pneumonia, 

 pleurisy, and the inhalation of solid irritating particles, is 

 witnessed in the human being. It is characterised by thick- 

 ening of the interlobular septa and alveolar walls ; and when 

 the fibrosis is extensive, the lung is diminished in size, the 

 tissue is smooth, dense, being in parts almost cartilaginous in 

 consistence, and irregularly mottled with black pigment. The 

 alveolar structure of the lung is in most parts destroyed, and on 

 section the dilated bronchi are seen as numerous large open- 

 ings scattered over its surface. The dilated bronchi frequently 

 become the seat of secondary inflammatory processes, which 

 may lead to ulceration, and ultimately to extensive excavations of 

 the indurated tissue ; but there is a complete absence of caseous 

 changes. The pleura is almost invariably thickened and adherent, 

 the new formation in the earlier stages usually contains new 

 blood-vessels, but later the tissue contracts, and the vessels 

 become destroyed ; the contraction of the false membrane may 

 also induce deformity of the chest, and twist the neck to one 

 side. I have seen a case similar to the above description in a 

 dog in which the lungs contained quantities of sand. This dog 

 had been several years in Africa hunting with its master. 

 Before death it was observed that the right side of the chest 

 was depressed, and this was found to be due to carnification and 

 contraction of the adherent lung and connecting new formation. 



