PLEURO-PNEUMONIA. 341 



pleuro and pneumonia. Mj own opinion is, however, and 

 it is almost a certainty, I think, that the single name ple- 

 urisy would cover the whole ground, for the pathology of 

 the disease unmistakably points to this one fact, that the 

 lungs are not affected as a disease from the beginning, 

 but the solid, spotted and mottled condition of the lungs 

 are but the effects of disease of the pleural covering, and 

 consequent effusions of serum into the chest, floating and 

 surrounding the lungs, together with weakness, low vita- 

 lity, and debility of the animal affected. This then is 

 the reason why the lungs have become diseased, and the 

 consequent double name given to the affection. 



However much men may doubt it, this diseases is no- 

 thing more than buccal inflammation, extending from the 

 coverings of the mouth and nose down to the pleural 

 membranes within the chest, speedily followed by exten- 

 sive outpouring of fluid called serum, and it is not till 

 this fluid has accumulated in sufficient quantity that the 

 evidences of disease show itself to the farmer or breeder. 

 Cows are not so nervous, nor yet so excitable as horses 

 are, whether in health or sickness, and hence, the ab- 

 sence of those symptoms in the early stage of the disease 

 in cows, which are so early shown in horses, when af- 

 fected by the same sickness. * Farmers, remember this, 

 for in early detection lies often the life of the animal. 



Again, and in support of my theory, if the lungs were 

 one of the primary seats of the disease, it would not be 

 reasonable to expect the animal to live for a week, and in 

 some cases a month, as is the case with animals affected 

 with this disease. In no disease of the lungs, excepting 

 tubercles, will animals live so long as those do when af- 

 fected with pleuro-pneumonia, thus entirely disproving 

 the universal theory of all and every person who has an 

 idea to offer upon the subject. 



