296 DISEASES OP CATTLE. 



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 the consequent 

 effusions of serum into the chest, floating and surrounding 

 the lungs, together with weakness, low vitality, 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 disease is nothing 

 more than buccal inflammation, extending from the cover- 

 ings of the mouth and nose down to the pleural membranes 

 within the chest, speedily followed by extensive 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, whether in 

 health or sickness, and hence the absence of those symp- 

 toms in the early stage of the disease in cows, which are so 

 early shown in horses, when affected by the same sickness. 

 Farmers should 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 

 affected with pleuro-pneumonia, thus entirely disproving 

 the theory universally entertained by those who have an 

 idea to offer upon the subject. 



The length of time animals live witli this disease, to- 

 gether vnth the serum, the condition of the lungs, and the 



