ROARING. 51 



When all the swelling has subsided, and the tumour 

 l>ecomes flattened, and the matter assumes a thick white 

 appearance, the seton may be removed, and the ulcer dressed 

 with the following ointment : — 



Digestive ointment . . ^ ounce, 

 Nitrated ointment of mercury, ^ ounce, 

 Bees'-wax . . . i ounce. 



The wound should be washed with a lotion composed of 

 Muriate of mercury . . ^ drachm. 

 Lime-water ... 6 ounces. 



ROARING. 



Symptoms. — This is a disease arising from an affection of 

 the larynx and superior portion of the windpipe. "When a 

 horse so affected has been hard trotted or galloped, he may 

 be heard at some distance to utter a grunting sound. Or 

 when he is standing, if touched suddenly in the loins with 

 a whip or stick, he will involuntarily grunt or groan. 

 Dealers are frequently in the habit of practising this test ; 

 because, if a horse is moderately exercised or at rest, this 

 complaint never manifests itself. 



Cause. — It is supposed to be produced by a thickening of 

 the larynx and upper portion of the windpipe, in conse- 

 quence of previous inflammation, and thus obstructing the 

 passage and limiting its action. After strangles this disease 

 frequently follows. Tight reining is also a common cause 

 of this evil. By this the action of the larynx and superior 

 muscles of the windpipe are circumscribed, and ultimately 

 become semi-paralysed, with consequent loss of power and 

 action ; therefore, the opening not being sufl&ciently capacious 

 during the rapid breathing occasioned by violent exercise, 

 the pressure of the air rushing through the circumscribed 

 space, the sound is produced which has been absurdly termed 



