DISEASES OF THE KESPIKATOEY ORGANS. 57 



continues to increase, the stimulant may be discontinued for a few days, 

 and warm water again used. 



In many cases, the lining membrane of the sinus will be found to be 

 greatly thickened, and perhaps a quantity of dried mucus may be lodged 

 within it, which will be gradually got rid of by the action of the injec- 

 tion. Care must be taken not to allow the skin to close completely the 

 orifice, before the discharge has for some days entirely ceased. 



During treatment the animal should be fed well. If the head is hot., 

 it should be frequently bathed with cold water. Mineral tonics should 

 be freely administered throughout. 



When in spite of our treatment the diseased action of the mucous 

 membrane continues, it becomes a question whether it is advisable to 

 keep the animal. A horse with an unhealthy discharge from his nostrils 

 cannot with safety be kept near others or worked with them. "We cannot 

 tell when such a case may run into glanders. The animal is therefore 

 practically useless, and had better be killed. 



CHRONIC COUGH. 



Definition. — Chronic cough is a very troublesome affection. It may 

 have its seat either in about the larynx, in the respiratory passages, or in 

 the lungs. 



Etiology. — It usually arises from morbid sensibility of the nerves of 

 the larynx, or from irritability left in its lining membrane or in the bron- 

 chial tubes after pneumonia, bronchitis, or influenza. Or it may be con- 

 nected with indigestion, and, indeed, it may be said frequently to be a 

 symptom of that affection. An intimate connection, as the reader is 

 aware, exists between the nervous system of the stomach and that of the 

 lungs. Hence, derangement of the former is ajit to set up irritation in 

 the latter. Thus horses suffering from worms are often affected with 

 chronic cough. It also constantly accompanies broken wind; and in 

 some cases it exists without any appreciable cause. In horses subject to 

 this disease, very trifling causes, such as the change from the atmosphere 

 of the stable to the open air, or the mere act of eating or of drink- 

 ing, or a change of weather, or a little unwonted excitement, such as a 

 trot or a sudden blow, are often sufficient to produce iri'itation and con- 

 sequently cough. 



