A course of dilute nitric acid will often be of service in later syphilitic cachexia, especially after mercurials have been used, and in debilitated subjects. It benefits ulcerations of the mouth, throat, and nose, and also periosteal swellings, and may be applied at the same time in the form of bath - 1 to 2 oz. for each bath. Mercurial salivation is relieved by the acid.