_(c)_ Necrosis in the nasal chamber is a cause of catarrh, inasmuch as the fragments of bone lying within the nose excite irritation and induce discharge. I have never seen a case of this form of disease which was not due to syphilis. The remains of syphilitic angina are apt to be present, and the general manifestations of constitutional syphilis are well developed. The septum is more frequently affected than the turbinals. Discharge due to necrosis can be readily distinguished from that arising from any other cause by the presence of detached fragments of denuded bone, by the characteristic fetor, and by the history of the case. The prognosis is favorable, for all symptoms will cease upon the extraction of the fragments, or at least those which remain are of an entirely different character, and are due to the resultant imperfections of the septum, and consequent irritation arising from the too free entrance of air into the {50} nose. I have seen in one case an extensive tumefaction and infiltration of the tissues covering the middle turbinated bone at the same time that the septum was breaking down. These masses require treatment with the galvano-cautery and astringents after the dead fragments have been removed. A TABLE OF NASAL DISEASES GROUPED BY SYMPTOMS. Cases in which interference with nasal respiration is a conspicuous symptom: Due to deflection of nasal septum (common). Due to angiose hypertrophy of the mucous membrane (common). Due to tumors lodged in the nasal chamber. Due to adenoid hypertrophy in the naso-pharynx. Due to over-activity of the levator palati muscles (rare). Cases in which discharge is a conspicuous symptom: Due to hyperplasia of the mucous membrane over the turbinated bones (common). The discharge when flowing backward is described as a dropping; when forward, as a running at the nose. The discharge is either mucoid or muco-purulent. Due to tumors lodged in the nasal chambers or appendages. The discharge is usually excessive. When due to myxomata (polypi) the discharge is mucoid (common). In inflammatory complications of the same the discharge is muco-purulent (common). When due to neoplasms other than myxomata the discharge is purulent, and rarely muco-hæmic (rare). Cases in which retention of mucus in the nose or upper part of the throat is a conspicuous symptom: Due to retention of inspissated mucus at the roof of the naso-pharynx (common). Due to the mucous secretion of the nose and throat being excessively tenacious (rare).