Mixtures of food are best, as of cut hay, meal, and roots. Old horses, or such as are put to hard labor, will do much better if their food be given in the form easiest of digestion. No inconsiderable part of the vital power is exhausted by the digestion of dry, raw food. Horses ought to be fed, and if possible, exercised or worked regularly, but never on a full stomach. This is a frequent cause of disease, and especially of broken wind. If their food is given at the proper time, and the horse be allowed to finish it at once, without expecting more, he will lie down quietly and digest it. This will be much more refreshing to him, than to stand at the rack or trough, nibbling continually at his hay or oats. What remains after he has done feeding, should be at once withdrawn. They should have water in summer three times, and in winter twice a day. Soft or running water is much the best. While working, and they are not too warm, they may have it as often as they desire. Neither should they be fed when heated, as the stomach is then fatigued and slightly inflamed, and is not prepared for digestion till the animal is again cool. Salt should always be within reach, and we have found an occasional handful of clean wood-ashes, a preventive of disease and an assistance to the bowels and appetite. [Illustration: Fig. 29. Skeleton of a Horse. A The Head.--_a_ The posterior maxillary or under jaw.--_b_ The superior maxillary or upper jaw. A little lower down than the letter is a foramen, through which pass the nerves and blood-vessels which chiefly supply the lower part of the face.--_c_ The orbit, or cavity containing the eye.--_d_ The nasal bones, or bones of the nose.--_e_ The suture dividing the parietal bones below from the occipital bones above.--_f_ The inferior maxillary bone, containing the upper incisor teeth.--B The Seven Cervical Vertebræ, or bones of the neck.--C The Eighteen Dorsal Vertebræ, or bones of the back.--D The Six Lumbar Vertebræ, or bones of the loins.--E The Five Sacral Vertebræ, or bones of the haunch.--F The Caudal Vertebræ, or bones of the tail, generally about fifteen.--G The Scapula, or shoulder-blade.--H The Sternum, or fore-part of the chest.--I The Costæ or ribs, seven or eight articulating with the sternum, and called the _true ribs_; and ten or eleven united together by cartilage, called the _false ribs_.--J The Humerus, or upper bone of the arm.--K The Radius, or upper bone of the arm.--L The Ulna, or elbow. The point of the elbow is called the Olecranon.--M The Carpus, or knee, consisting of seven bones.--N The metacarpal bones. The larger metacarpal or cannon or shank in front, and the smaller metacarpal or splint bone behind.--_g_ The fore pastern and foot, consisting of the Os Suffraginis, or the upper and larger pastern bone, with the sesamoid bones behind, articulating with the cannon and greater pastern; the Os Coronæ, or lesser pastern; the Os Pedis, or coffin-bone; and the Os