286 Veterinary Medicine. 



blood-stained urine, associated with the oppressed breathing and 

 physical signs of local consolidations of lung tissue form a picture 

 which is almost pathognomonic. The occurrence of a number 

 of cases in the same herd, with little disposition to extend to 

 other adjacent herds having a different feeding and environment 

 is still more conclusive. In lung plague, except in very hot 

 weather, the disease develops much more slowly, and at an early 

 stage the amount of lung infiltrated is much more extensive, 

 while the indications of destruction of blood globules are virtu- 

 ally absent. In black- quarter, affecting the lung, there is liable 

 to be an implication of the walls of the chest, and in such a case 

 there is crepitation under the touch, and the exudate contains 

 the sporulating round-ended bacillus in abundance. From the 

 ordinary type of bovine hsemorrhagic septicaemia it is distin- 

 guished by the absence of the external exudations which so fre- 

 quently characterize that disease. 



Lesions. On opening the chest there is usually found some 

 liquid exudate, and there may be adhesions between the lungs 

 and the ribs, yet neither liquid nor false membrane is likely to 

 be as extensive as in lung plague. The lungs, especially in the 

 anterior lobes and in their lower portions, are filled with exudate 

 in areas usually circumscribed by the margins of lobules. If the 

 exudate is recent it is still liquid or semi-liquid, and the part re- 

 tains much of its elasticity and tenacity. Viewed on the surface, 

 the affected portion of the lung is marked off into islets repre- 

 senting the lobulettes by the lighter colored exudate in the inter- 

 lobular connective tissue, and again in the centre of each ulti- 

 mate lobulette a light colored area representing the infiltrated 

 bronchiole and air sacs. Such portions, when incised, allow the 

 escape of a considerable amount of blood and serous exudate. In 

 parts where the morbid process is of older standing the exudate 

 has coagulated, and the affected lung is solid, compact and fria- 

 ble, from a clear red to a dark brown or black, and on section it 

 shows a marbling like that of lung plague, only the yellow lines 

 of interlobular tissue are much less thick than in that complaint, 

 and the hepatization tends to be more sharply circumscribed by 

 the outline of individual lobulettes. The hardness and friability 

 encreases toward the centre of the lobulette indicating the greater 

 activity of the morbid processes in and around the bronchioles. 



