OZENA. 239 



after the animal has recovered from Sore Throat, Cough, and the 

 systemic fever so common to both these maladies, a thick 

 muco, or muco- purulent, discharge continues to issue from one 

 nostril, (generally from the left) ; and that in spite of all treat- 

 ment of an ordinary kind, the case, if anything, becomes worse. 



The animal may cough, or may not. The lymphatic glands 

 in the submaxillary space may be enlarged, or may not ; in 

 fact it is seldom they do enlarge, until the disease has been 

 established for several weeks, or even months, in which case 

 they will be tumified, hut not adherent to tlie sides of tlie jaws. 

 The appetite may be good, or may not ; if good, and the animal 

 be liberally fed, he may, in spite of the disease, continue to 

 improve in his general condition. 



Sometimes the discharge will cease for even weeks at a 

 time ; then be renewed, and flow as abundantly as before. 

 Its colour and consistency may also vary considerably ; at one 

 time being of a dark yellow — at another thick, white, and like 

 clouted cream. In the generality of cases the discharge stinks 

 excessively, especially in a morning. 



In the state as described above, the disease may remain for 

 weeks, months, and even years ; or Glanders may supervene, 

 and the patient have to be destroyed in consequence. 



Seat of the Disease. — The disease has its seat upon and 

 within the mucous membrane of the nose, among the turbinated 

 bones, and also within and upon the mucous membrane lining 

 the cells of the ethmoid bones. 



In health the turbinated bones are very little thicker than 



ordinary brown paper; they resemble, in fact, hollow tubes 



made of that material, by twisting the paper upon itself. Their 



outer surfaces are convex; internally they are concave, and 



are divided into long parallel tubes and cells, the whole of which 



