This consists in the swelling of the bars of the mouth to a level or even above the teeth. It may occur from inflammation of the gums; shedding of the teeth; a febrile tendency, and from over-feeding or want of exercise. It will generally subside by low dieting and proper exercise; or it may be at once relieved by lancing the bars with a sharp penknife. Poll-evil. This arises from some contusion or injury to the head, which produces a swelling that eventually suppurates. The inflammation may be abated, in its earliest stages, by a blister; and in its later, by bleeding, physic, and cold lotions applied to the part. If these are ineffectual, and the swelling continues, it should be hastened by poultices, and warm, stimulating lotions; and when fully formed, the tumor must be opened, so as to permit all the matter to run out. Repeated applications of salt will sometimes cure it. Heaves. All those affections, distinguished in the English veterinary works as _pneumonia or inflammation of the lungs_, _chronic cough_, _thick and broken wind_, _consumption_, _&c._, are popularly designated as _heaves_. To some or all of these the horse may have an hereditary or constitutional tendency. Their incipient stages are also induced by a sudden transition from heat to cold, and sometimes from cold to close and hot stables; and by a chilly wind or damp stables, especially after severe exercise. Feeding on musty, dry hay, or on straw, will produce an irritation which may lead to heaves. _Inflammation of the lungs_ is frequently dangerous, and requires the immediate and full use of the lancet. After the inflammation is decidedly allayed, by copious bleeding, small doses of aloes may be given, and frequent injections of warm soap and water, which should be omitted the moment the feces become soft and approaching to the fluid state. Blistering the sides and brisket, to be often repeated if otherwise ineffectual, must be resorted to. Convalescence should be followed with sedative medicines, and during all the severe stages of the disease, withhold all food, except light gruels after protracted abstinence. As health returns, put the animal out to grass. Inflammation of the lungs is sometimes succeeded by a _chronic cough_, and the other maladies enumerated. When firmly seated, it is incapable of removal. Its effects can be alleviated, and with suitable food and treatment, the horse may be made to do much moderate labor for many years, but he can never become sound or sustain great exertion. Equal and proper temperature, moist, stimulating food, and especially carrots or potatoes, and moderate exercise, (but never on a full stomach,) and dry, clean stables, are all the remedies that can be prescribed. Catarrh or Horse Distemper.