THE EQUINE HOSPITAL FORMULARY. 149 



ning of the malady the animal loses control of inspiration, 

 and then of co-ordination of both inspiration and expiration. 

 Moreover, the sound is at first purely laryngeal, but after- 

 wards the vibratory movement of the false nostrils adds to 

 the noise. 



In order to detect if a horse be a roarer, ride the horse 

 gently, and then at a steady gallop, or run the animal 

 round and round in a circular run. Roaring is due to 

 atrophy and fatty degeneration of certain muscles of the 

 larynx, especially of those which pass between the arytenoid 

 cartilages and attach them to the cricoid posteriorly. It is 

 really a form of wasting palsy. It often appears after 

 several attacks of sore throat and cold. The roarer 

 generally has a characteristic cough, .v^hich is loud, harsh, 

 and dry. 



AVhen following influenza, catarrh, or strangles, roaring 

 should be treated with iodide of potassium, quinine, and 

 liquor arsenicalis. The throat should be blistered with 

 ointment of cantharides and biniodide of mercury. Most 

 cases of roaring are due to atrophy and paralysis of the 

 laryngeal muscles. Blisters applied to the skin of the 

 laryngeal region are useful. Chlorate of potassium may 

 be of service. The measures tried are: (1) Electricity, 

 (2) iodide of potassium, in doses of two drachms once daily, 

 combined with tonics, (3) blisters, (4) excision of the left 

 arytenoideus posticus cartilage, together with a small 

 portion of the corresponding vof^al cord, (5) tracheotomy. 



Draught. 



R. Liquor Fowleri, f. 5ii. 

 Potass, chloratis, ^i^ 

 Tinct. zingib., f. ^\. 

 This draught may be administered with six fluid ounces 



