CAUSTICS
—are medicines which externally constitute a destruction of the texture (or superficies) of the parts to which they are applied. Caustics are of different kinds, and of various powers, according to the reduction, or extirpation, for which they are intended. The actual cautery, or red-hot iron, is used in firing, as well as for the farther prevention of sand-cracks already broke out. The antimonial caustic, or butter of antimony, (in judicious hands), is a complete and perfect cure for poll evil, fistula, quittor, and canker in the foot. Lunar caustic is an admirable counteraction to warts, and fast-shooting fungus. Red precipitate is an excellent substitute, when so much strength is not required; few wounds in horses can be brought to a favourable state of cicatrization without it.