A horse is said to roar when, during progression, he emits any unnatural sound. The noise is not exactly of the same intensity in any two animals. Some creatures roar so loud as to attract attention from the foot passengers; others have so trivial a defect in this particular, that it can only be detected after a breathing gallop. In all, however, it materially lessens the value. It is usual to cough horses suspected of being =roarers=; this, however, is wrong. The constant pinching of the larynx may induce the affection. The cough of a confirmed roarer, however, is peculiar. It consist of a double effort; a spasmodic expulsion of the air, followed by a deep and audible inspiration. The best mode of detecting a roarer, where exercise is forbidden or impossible, is to get a stick and to quietly approach the suspected animal. Having reached the head, take a short hold of the halter, and all at once display the weapon, at the same time making a pretense as though about to use it violently upon the abdomen. The horse in alarm will run toward the manger, and, if a roarer, the action will be accompanied by an audible grunt. This proof, taken with the refusal to allow the horse to be tried, is generally conclusive though by itself the test is by no means satisfactory. Many horses that are not roarers will sometimes grunt under the emotion of fear. Of =roaring= there are two kinds, acute and chronic. =Acute roaring= is that which is merely symptomatic of a disease. It may be produced by the tumor of strangles compressing the larynx; by the impediment, in choking, being situated so high up as to interfere with the breathing; and by many other causes. In these cases remove the excitant, and the effect will immediately cease. Acute roaring is, therefore, a very trivial affair, excepting so far as it indicates the severity of the complaint, which generates the affection.