ROARING. 
51 
When all the swelling has subsided, and the tumour 
becomes 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 01 
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 sufficiently 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 
