A horse should be carefully prepared for the action of physic. Two or three bran mashes given on that or the preceding day, which should be continued until the dung becomes softened, as a less quantity of physic will then suffice. On the day which the physic is given, the horse should have walking exercise, or may be gently trotted for a quarter of an hour twice in the day; but after the physic begins to work, he should not be moved from his stall. A little hay may be put in the rack, and as much mash given as the horse will eat, and as much water as he will drink with the coldness off. Aloes is the best purgative, for there is no other that is at once so sure and safe--the dose is from ½ to 1 ounce, if the horse is properly prepared. The only other purgative on which dependence can be placed is the croton; the dose varies from 1 scruple to ½ a drachm. Linseed oil is an uncertain but safe purgative, in doses from a pint to a pint and a half. Epsom salts are an inefficacious remedy except in the immense dose of a pound and a half, and then they are not always safe. SPRAINS OF THE BACK SINEWS. Should there remain the slightest lameness or enlargement, the leg must be blistered; and it would seldom be a bad practice to blister after every case of severe sprain. The inflammation may lay deep, and the part once sprained may long remain weak, and subject to renewed injury, not from unusual but ordinary exertion. The horse should be afterwards turned out for one or two months. We must here again repeat that a blister should never be used while any heat remains. ENLARGEMENT OF THE HOCK. A horse with an enlarged hock must always be regarded with suspicion: in truth he is unsound. The animal may discharge his usual work during a long period, without return of lameness, but when all his energies are required, the weakened part will fail. The treatment is plain enough: fomentations, blistering, &c. may remedy the evil. SPRAIN OF THE COFFIN JOINT. The proof of this is when the lameness is sudden, and the heat and tenderness are principally felt around the cornet. Bleeding at the toe, physic, fomentations and blisters are the usual means adopted. This lameness is not easily removed even by a blister, and if removed like sprains of the fetlock and of the back sinews, it is apt to return again. Sprains of the coffin joint sometimes become a very serious affair; not being attended by any swelling, and being detected only by heat around the coronet. First reduce the heat by fomentations: say bathe the foot with water as warm as the hand will bear, fomentate with this for 15 or 20 minutes--the long continuance of fomentations has been found very efficacious in reducing inflammation; next apply a clay poultice made with vinegar, and when getting dry moisten by pouring vinegar on the foot and clay. After the heat has left the parts, then blister. The horse should not be used for a month or two. GREASE.