The synovial capsule of the fetlock joint in the ox is strongly supported in front and at the sides, but may protrude under the anterior ligament, producing a swelling behind the metacarpus under the five branches of division of the suspensory ligament and slightly below the sesamoid bones. These distensions, like bursal swellings, are commoner in hind limbs and in old working oxen. Their development is always followed in time by a certain degree of knuckling over. At first the metacarpus and phalanges come to form a straight line, but later the fetlock joint itself is thrust forward. =The diagnosis= necessitates careful manual examination of the region of the fetlock joint. =The prognosis= is somewhat grave, for the disease sooner or later necessitates the destruction of certain animals. =Treatment= is practically identical with that used in all such conditions: friction with camphorated alcohol, cold affusions and massage in the earlier stages, followed if needful by blisters or firing in points. DISTENSION OF TENDON SHEATHS. Distension of the synovial capsule which surrounds the superior suspensory ligament, like distension of the articular capsule of the fetlock, occurs in working animals, and most commonly affects the front limbs. It is indicated by two swellings, one situated on either side of and behind the branches of division of the suspensory ligament and in front of the flexor tendons. These two swellings extend higher than the articular swellings, which, however, they sometimes accompany. The surface of the fetlock is then swollen, doughy on pressure, and somewhat painful. These enlargements may produce more or less marked lameness and cause knuckling. =The diagnosis= is clear from local examination. =The prognosis= is unfavourable, as the animals after a time become useless for work. =Treatment.= The beginning of the disease may often be cured by baths of running water, combined with massage. At a later stage, local stimulants, blisters, or firing are necessary. The best treatment probably consists in puncturing the parts with antiseptic precautions, washing out the synovial cavity with an antiseptic, and immediately afterwards lightly firing the surface of the region in points. DISTENSION OF TENDON SHEATHS IN THE REGION OF THE KNEE. Any of the numerous tendon sheaths which facilitate the gliding of tendons in the neighbourhood of the knee may become inflamed and give rise to a chronic synovial swelling. The commonest of such swellings is due to distension of the sheath of the extensor metacarpi magnus, which appears as a vertical line in front of the knee, extending from the lower third of the forearm and slightly to the outer side of the central line. This synovial enlargement arises in oxen working on broken roads, in clay or marshy soils, where the animals are liable to stick fast, and are often obliged to struggle vigorously in order to extricate themselves.