SYMPTOMS.—The horn at the toe (of the fore-feet of troop and riding horses, but frequently the hind feet of cart horses) becomes “seedy,” and crumbles away like so much saw-dust or the dry rot in wood; while at the junction between the wall and sole a fissure will be apparent, leading upward between the outer and inner crusts of the wall, sometimes extending up to the coronet, and in old cases laterally, so that there is some difficulty in finding a piece of horn sufficiently sound to hold a nail, and side clips become necessary in keeping the shoe on. Percussion on the wall of the hoof with a hammer will show to what extent the separation has taken place. TREATMENT.—The whole of the crust, as far as it is separated from the horny laminæ underneath, must be cut away, and the foot bound up with tar, tow, and broad tape. VETERINARY OIL applied to the coronet will hasten the downward growth of the wall. Keep the horse standing in clay, daily anointing the hoof with VETERINARY OIL. Both means have been successfully tried. Give J.K. morning and night. Navicular Joint Disease This disease is far more frequent than is usually supposed, and many horses are ruined by it, the lameness being generally referred to the shoulder or to some other part not at all in fault. Behind and beneath the lower pastern bone in the heel of the horse, and behind and above the heel of the coffin-bone, is a small bone called the navicular, or shuttle-bone. It is so placed as to strengthen the union between the lower pastern and coffin-bone, and to enable the flexor tendon which passes over it to be inserted into the bottom of the coffin-bone and to act with more advantage. It thus forms a kind of joint with that tendon. There is a great deal of weight thrown on this bone and from this navicular bone on the tendon, and there is considerable motion or play between them in the bending and extension of the pasterns. It is easy to conceive that from sudden concussion or from rapid and over-strained motion, and at a time when, from rest and relaxation, the parts have not adapted themselves to the violent motion required, there may be excessive play between the bone and tendon, and the delicate membrane which covers the bone or the cartilage of the bone, may become bruised, inflamed and injured, or destroyed, and that all the painful effects of an inflamed and open joint may result, and the horse be incurably lame. Numerous dissections have shown that this joint thus formed by the tendon and bone, has been the frequent and almost invariable seat of these obscure lamenesses. The membrane covering the cartilage becomes inflamed and ulcerated; the cartilage itself is ulcerated and eaten away, the bone has become carious, and bony adhesions have taken place between the navicular and pastern and coffin-bones, and this part of the foot has become completely disorganized and useless.