608 



SPORA.DIC DISEASES, 



As the symptoms are developed, the cough becomes hoarse, 

 ringing, loud, and paroxysmal ; the respirations are in some 

 instances greatly accelerated, indeed out of all proportion to 

 the pulse. For example, the pulse may be seventy or eighty per 

 minute, and the respirations as numerous, or even more so : this 

 indicates bronchitis affecting the smaller tubes and alveolar 

 walls — catarrhal pneumonia — collapse of a more or less exten- 

 sive area of lung structure, or even occlusion of non-inflamed 

 bronchi and air vesicles by the gravitation into them of the 

 catarrhal fluid, as shown in the woodcut. 



Fig. 36.— S 1 1 I _ 1 1 1 is, occluded by a 



plug of catarrhal secretion. — 350 diam. a, Catarrhal plug ; 6, Epithelium 

 lining bronchus ; c, Surrounding adventitious coat infiltrated with cells. 

 — (From American ox condemned at Liverpool for pleuro-pncumonia. ) 



Bronchitis of the larger tubes is naturally less dangerous tlian 

 the other two, and only proves fatal by inducing the two above- 

 mentioned conditions, namely, collapse and occlusion of a more 

 or less extensive breathing surface. 



Amongst the foreign horses above alluded to, it was noticed, 

 where the discharge of muco-purulent matter was most profuse, 

 althouo-h some of the animals seemed to recover from the febrile 



