132 PRACTICE OF EQUINE MEDICINE. 



What is the causation? 



It may occur as a primary disease or as the result of several 

 acute attacks; or, again, it may be the sequela or an extension of 

 a pharyngitis, or a chronic nasal catarrh, or a bronchitis. 



What are the symptoms? 



They seem to be altogether local, and consist principally in 

 a hoarse and husky persistent cough, the animal otherwise being 

 apparently healthy; they eat well and seem to feel well. 



If the animal is taken out of a warm stall into the cooler air, 

 he coughs for a time, causing a white mucous discharge. There 

 is some pain on pressure over the larynx, associated with coughing; 

 there is thickening of the mucous membrane, with varicose veins. 



What is the prognosis ? 



This depends on the pathological changes; the prognosis is 

 good as regards life. These cases are often hard to cure, especially 

 in old animals. 



What is the treatment? 



The treatment should be both constitutional and local, and is 

 about the same as for an acute case. The cough may be quieted 

 by giving sodium bromide, or a solution of morphine, or bella- 

 donna, or cocaine. 



Locally, counter-irritation may be of service; also, astringent 

 gargles. Swabbing out throat with astringent or slight caustic 

 solutions. 



LAEYNGEAL (EDEMA. 



What are the synonyms ? 



(Edematous laryngitis, dropsy of larynx, oedema of the glottis 

 (incorrectly so called). 



Give a definition of this affection. 



It is a term used to indicate the occurrence of a dropsical 

 effusion or an inflammatory exudation into the areolar tissue be- 

 neath the laryngeal membrane. It is really not an oedema of the 

 glottis, but of the upper portion of the larynx. 



What is the pathology? 



The effusion is generally of a serous or sero-purulent character, 

 and is found in the loose cellular tissue beneath the mucous mem- 



