ROARING. 469 



Make into one powder or ball, and give once a day for a week. 



If no improvement is noticeable, omit the calomel, and give for a 



week or two longer. 



Spanish brown 2 oz. 



Tartar emetic ,.,.2o!. 



Resin _.„...'. 4 oz. 



Ginger. 2 oz. 



Mix and give two teaspoonfuls twice a day in the feed. 



, Vegetable tar, in mass } oz. 



Gum camphor ,\ oz. 



Tartar emetic 1 dr. 



Form into balls, one of which is to be given once a day. 



Indigo '. 1 oz. 



Saltpeter ". .' 1 oz. 



Rain-water 1 gal. 



Mix and give a pint twice a day in the feed. / 



Roaring. 



This is a very annoying difficulty, for which there is no satis- 

 factory treatment. Like chronic cough, it often follows an attack of 

 laryngitis or of distemper (strangles), and in these cases we believe 

 it is owing-to a wasting (atrophy) of the muscles of the head of the 

 windpipe (larynx), whereby its caliber is diminished, and when the 

 air rushes in during violent exertion, a roaring sound is produced. 

 The senseless and cruel practice of tight-checking, in addition to the 

 throat-latch being often buckled so tightly as to obstruct the 

 breathing, is also a very common exciting cause. 



Symptoms. — When the horse is not excited, and so long' as the 

 air passes in a uniform rate through the larynx and windpipe, the' 

 animal does not feel any inconvenience ; whenever he is excited or 

 galloped, causing a rush of air, the roaring noise is produced. The •. 

 sound in ordinary circumstances is only produced on inspiration, but 

 in very severe cases the sound is audible both on inspiration and 

 expiration. 



Irt some horses, roaring is difficult of detection. There are sev- 

 eral tests which can be resorted to with the view of detecting it.' 

 It may often be readily detected by taking the horse firmly by the 

 head and striking him suddenly on the side, causing him to start for- 

 ward,; if a grunting noise is emitted, it is always a suspicious cir- 

 cumstance'. But the better test would be to gallop the horse sharply 

 for some distance, then pull him up quickly, and by applying the 

 ear to the, nostrils or to the windpipe, any abnormal sound will at 

 once be noticed. A good test in the case of draught horses is to 

 compel them to draw a heavy load. 



