EPIZOOTIC PNEUMONIA, 3G9 



condition of the system is induced by the abundance of effete 

 materials in the circulation, removed by absorption from the 

 transformed exudates. This has been compared by Professor 

 Gamgee to the hectic fever of the human being. There is 

 much emaciation, imperfect digestion, capriciousness of the 

 appetite; the hair is easily removed from the mane and tail; 

 irregularity in the surface temperature ; and continuance of the 

 increased temperature of the body, as indicated by the thermo- 

 meter. If this condition of the system be not successfully 

 combated, the respirations again become accelerated and the ribs 

 fixed ; there is flapping of the nostrils, which are greatly dis- 

 tended ; the animal again discontinues to lie down. Anasarcous 

 swellings may appear on the cliest, abdomen, and the legs, 

 denoting the presence of hydrothorax, to which the animal may 

 eventually succumb in the course of an indefinite period — some- 

 times in two or three days only, sometimes in as many weeks — 

 or symptoms of farcy or glanders may appear. 



POST MORTEM APPEAEANCES. 



In very acute cases, the appearances revealed by a post mortmn 

 examination are, intense redness of the pleural surfaces of one 

 or both sides of the chest; the engorgement of the vessels 

 embracing the visceral and parietal surfaces, and some degree 

 of effusion and exudation of lymph. In some instances, the 

 lungs show but little disease, whilst in others patches of inflam- 

 mation are found throughout their substance. The pericardium 

 and endocardium are generally more or less injected, and the 

 death of the animal at this early stage generally results more 

 from the cardiac complication than the pleural disease. It is 

 but seldom that a case terminates so rapidly, unless the animal 

 be kept at work after it has fallen ill. 



If the horse live for two or three days after the pleural symp- 

 toms have become manifested, along with the injection of the 

 vessels, an abundant quantity of serum will be effused into the 

 pleural sac, floating in which, and loosely adherent to the pleural 

 surfaces, bands of lymph will be found. These bands of lymph 

 are loose and watery, and tne serum is turbid or flocculent. 

 If the horse has lain for some hours after death, and the i^ost 



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