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 treatment of 

 an ordinary kind, the cage, 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 tumefied, hut not adherent to the sides of the 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 on© 

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

 clouted cream. In the generality of cases the discharge stiuks- 

 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 



