COUGH. 33 



reason to believe that the animal was restored, I operated 

 on the maxillary bone, below the eye, opening tlie maxillary 

 sinus, and injecting it. This, however, did no good. To 

 accomplish the cure, which I eventually did, J was com- 

 pelled to have recourse to trephining in another place, the 

 frontal sinus, for the second time. See the cases in vol. xx 

 of the Veterinarian. 



The modus curandi here appears to be, the destruction 

 of the lining membrane of the sinus, or rather the filling of 

 the cavity perhaps, in the end, with effused matters, which ulti- 

 mately become, it would appear, a sort of concentrated struc- 

 ture of bone, no longer yielding any discharge, all secretory 

 apparatus being as it would seem annihilated. This, there- 

 fore, would appear to be the object of treatment, and the way 

 to effect permanent cure, viz., to destroy all secretory tissue, 

 and fill up the cavity of the sinus. ^ 



COUGH. 



Definition. — Cough is the sound produced in the throat 

 by a sudden and violent expulsion of air from the lungs. 



Cough differs from roaring in being the product of 

 expiration alone, and in that expiration being of a convul- 

 sive nature : roaring results from impediment in breathing, 

 and is most remarkable in inspiration. 



Pathology. — From the circumstance of cough being 

 present as a symptom in several diseases, and in some with- 

 out being regarded, of itself, of other consequence than the 

 annoyance it gives rise to, it has become a question among 

 nosologists, whether, even when it appears to exist alone, it 

 can with propriety be viewed as an idiopathic affection. 

 Our observations certainly tend to erecting it, in certain 

 cases, into a disease sui generis ; although at the same time 

 we are prompt to admit that it occurs much oftener as an 

 attendant of some other malady. We have just seen that it 

 constitutes one of the ordinary symptoms — and on occasions 

 a very troublesome one — of catarrh ; we also find it present 

 in strangles, in bronchitis, and in laryngitis : it is also to be 

 met with in pleurisy and in certain stages of pneumonia. 



II. 3 



