OOTJGH.— CHHONIC COrGH. 287 



when they are feeding upon hay; in others, when travelling 

 down hill ; in others, when newly taken to work ; in others, 

 when bronght ia from work. In cases of the two last men- 

 tioned kinds, fits of coughing commence, and may continue 

 with intermission for perhaps more than an hour. In others; 

 the attacks are irregular, days even may elapse without a Cough 

 being heard, when suddenly the animal is seized, without any 

 apparent cause, and for. a time will cough in fits of perhaps a 

 minute's duration. In short, the varieties of Cough, both in 

 character of sound and in the conditions of its emission, are 

 endless. 



Causes. — The causes of Cough are innumerable ; amongst 

 others, I may enumerate Schirrosity of the lungs, from previous 

 attacks of Pneumonia or Bronchitis ; thickening of the mucous 

 membrane of the larynx ; atrophy of the arytenoid muscles of 

 the larynx ; the presence of rough calcareous deposits between 

 the inner surface of the ribs, and the costal surface of the 

 pleura.* Coughs arising from any of these causes are incurable. 



The more common causes are — Catarrhs ; Irritation in young 

 horses from teething; also Indigestion, arising either from a 

 repletion of food, or from the animal having partaken of 

 improper food. 



Teeatmbnt. — The best remedies in general are — Dulca- 

 mara 1, Capiphor, Bryonia 1, Extract of Belladonna, Belladonna- 

 1 and 3 ; also, Hyoscyamus 1 and 3, and Cupri Sulphur 3. 



* I was once talking .with Mr. Lawson, veterinary surgeon, Manchester, 

 upon Chronic Cough, and he related a very curious case of the kind. A'horse 

 which for years had suffered from Chronic Cough, and which had resisted 

 much treatment to remove it, at last died. The chest and its contents were 

 examined for the cause of the cough, and all that could be discovered was a 

 rough calcareous deposit beneath the pleura, which stretched and elevated the 

 membrane, and against, which the lung had suffered irritation. 



