This disease, in consequence of its assuming different forms during its progress, has a host of names applied to it, which rather embarrass than assist the farmer. We admit that there are numerous tissues to be obstructed; and if the disease were named from the tissue, it would have as many names as there are tissues. If it were named from the location, which often happens, then we get as many names as there are locations; for example, horn ail, black leg, quarter evil, joint murrain, foot rot, &c. In the above disease, the whole system partakes more or less of constitutional disturbance; therefore it is of no use, except when we want to avail ourselves of local applications, to decide what particular muscle, blood-vessel, or nerve is involved, seeing that the only rational treatment consists in acting on all the nerves, blood-vessels, and muscles, and that this can only be accomplished through the healthy operations of nature's secreting and excreting processes. The indications of cure, according to the reformed principles, are, to relax spasm, as in locked-jaw, stoppages of the bladder or intestines, obstructed surfaces, &c.; to contract and strengthen weak and relaxed organs, as in general or local debility, diarrhoea, scouring, lampas, &c.; to stimulate inactive parts, as in black leg, joint murrain, quarter ill, foot rot; to equalize the circulation, and distribute the blood to the external surface and extremities, as in congestions; to furnish the animal with sufficient nutriment for its growth and development. No matter what the nature of disease may be, the treatment should be conducted on these principles. The farmer will overcome a host of obstacles, that might otherwise fall in his way, in the treatment of joint murrain, when he learns that this malady, together with black leg, quarter ill or evil, black quarter, and dry gangrene are all analogous: by the different names are meant their grades. In the early or mild forms, it consists of congestion in the veins or venous radicles, and effusions into the cellular tissue. When chemical action overpowers the vital, decomposition sets in; it then assumes a putrid type; mortification, or a destruction of organic integrity, is the result. _Causes._--Its proximate causes exist in any thing that can for a time interrupt the free and full play of any part of the vital machinery. Its direct cause may be found in over-feeding, miasma, exposure, poisonous plants, poor diet, &c. The milk of diseased cows is a frequent cause of black leg in young calves. The reason why the disease is more likely to manifest itself in the legs is, because they are more exposed, by the feet coming in contact with damp ground, and because the blood has a kind of up-hill work to perform.