EPILEPSY, _s._ A convulsive motion of the whole body, or some of its parts, with a loss of sense. _Vide_ BLAINE, WHITE, PERCIVALL. EQUERRY, _s._ Master of the horse. EQUESTRIAN, _a._ Appearing on horseback; skilled in horsemanship; belonging to a horse. EQUIPAGE, _s._ Furniture for a horseman; carriage, vehicle; attendance, retinue; accoutrements, furniture. EQUIPOISE, _s._ Equality of weight, equilibration. ERGOT, _s._ A sort of stub, like a piece of horn, placed behind and below the pastern joint. ERRHINES, _s._ Powders which cause sneezing, by being blown up the nostrils. They are composed generally of hellebore, snuff, asarabacca, or turbith mineral. ERYSIPELAS, _s._ An eruption of a hot acrid humour. ESCHAR, _s._ A hard crust or scar made by hot applications. ESCHAROTIC, _a._ Caustic, having the power to sear or burn the flesh. Escharotics are generally in the form of powder. Such are nitric oxide of mercury (red precipitate), exsiccated sulphate of alumine (burnt alum), acetate of copper (crystallised verdigris), sulphate of copper (blue vitriol). These are applied, either separately, or two or more of them are mixed together, and finely powdered; sometimes they are mixed with bole armeniac or chalk, by which they are rendered milder, or with lard or digestive ointment. ESCHAROTIC POWDERS. No. 1. Exsiccated or burnt alum 2 dr. Nitric oxide of mercury ½ oz.—Mix. No. 2. Sulphate of copper 1 oz. Bole Armeniac 1 oz.—Mix. No. 3. Acetate of copper 1 oz. Burnt alum 2 dr.—Mix. _See_ CAUSTICS, ASTRINGENTS, DIGESTIVES, and DETERGENTS. ESCHAROTIC LINIMENT. Honey 8 oz. Muriatic acid 1 oz. Verdigris 1 oz. Mix over a slow fire. This liniment may be made stronger by substituting nitrous acid for muriatic, or by retaining the muriatic, and substituting for the verdigris one drachm of sublimate. A weaker liniment is made, and a very useful one, by using two ounces of vinegar instead of the muriatic acid. (See EGYPTIACUM). Escharotics are applied to foul ulcers, and are employed to destroy fungous or proud flesh.—_White._ ESCULENT, _s._ Something fit for food. ESSENCE, _s._ In medicine, the chief properties or virtues of any simple, or composition, collected into a narrow compass. _Essence of mustard_, composed of camphor, oil of rosemary, and oil of turpentine, is a good stimulating embrocation. ESSENTIAL, _a._ Necessary; important in the highest degree, principal; pure, highly rectified. _Essential oils_ are obtained by distillation from mint, pennyroyal, peppermint, lavender, caraway seeds, anise-seeds, juniper berries, lemon-peel, sandal-wood, &c.