When these sinuses communicate with joints, and depend upon diseased cartilages, tendons, or articulating surfaces of the bones, we can do very little in the way of curing them by injections or incisions; because we cannot thus remove the disease of the joint, but may increase it. Issues placed over the joint, with rest, cleanliness, and good diet, country air, &c. are the remedies chiefly to be employed in these cases; or, if hectic be induced, and these remedies fail, we must remove the diseased part, if this, on account of its situation, be practicable. When, however, these sinuses are superficial, and depend upon tendons not immediately connected with the articulation, it may be useful to lay them open, and treat the disease of the tendons with caustic, like a caries of a bone, or with escharotics, and stimulating applications. The fourth species of sinuses, are those where a specific action exists[39], and prevents the healthy ulcerative action from forming. Of this kind is the scrophulous sinus, which is generally accompanied with a caries bone, or diseased cartilage, and, therefore, is a complicated sinus[40]. This is distinguished, where the bone is diseased, by a shining or polished red skin, like a cicatrix, surrounding the fungus papilla at the orifice of the sinus, or the scrophulous-looking sore which exists there. When no caries bone exists, we have no papilla, but only the diseased ulcer at the orifice. In both cases, there are generally the marks of a scrophulous habit. In the first case, we are to treat the sinus as if it were of the third species. In the second case, we are to treat it as if of the second, conjoining the proper remedies internally, as will be mentioned in considering the cure of scrophulous action. These sinuses, although healed, have a tendency to break out again, especially in the spring or summer. [39] These sinuses cannot be considered in this dissertation. [40] This may sometimes be produced by the formation of an abscess, without any evident cause; but at other times it is produced by wounds, &c. in scrophulous habits.