ROARING. Those desirous of becoming accurately acquainted with this disease are referred to Mr. Percivall's interesting Lecture on it (vol.ii. p. 242). After denominating the different degrees of the complaint— such as piping, wheezing, whistling, high blowing, and grunting—he enters upon what he terms the ratio symptomutuin, or theory of roaring. " I may observe," he says, " that it bears an analogy to croup, both in relation to the proximate cause, and to the parts affected: but we must be on our guard not to carry this comparison too far, or it will lead us into serious pathological error; for, although I may broadly assert that the proximate cause of roaring is grounded on cynanche trachealis, the inflammation does not put on that type which makes croup so formidable and dreaded a malady in a human being; neither is it confined to the years of immaturity. When roaring does happen in colts, it generally exists as a mode of termination of strangles: the catarrhal affection that accompanies strangles now and then continues long after the wound in the throat is closed up; leaves the laryngeal membrane thickened, and perhaps ulcerated; and thus lays the foundation of this disease.
The causes of cynanche, Mr. Percivall tells us, are similar to those which give rise to what we call common colds and pulmonary affections in general; but that it sometimes proves to be an extension or a sequel of the former, and a precursor of the latter. Mechanical injury, however, frequently produces roaring; and especially that occasioned by horses standing for many hours in the day on the bearing rein, by which their larynges are compressed, and tracheae distorted, to an extent nature never intended they should be. On this part of the subject Mr. Percivall writes thus:—" It may be remarked here (speaking of mechanical injury being a proximate or exciting cause of roaring), that simple flexion of the pipe itself, from the forcible and continued incurvation of the nose towards the chest, has been known to produce roaring."
Harewood, Harry. A Dictionary of Sports. London: T. Tegg and son, 1835
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