Perhaps the best procedure is to precede medicinal applications by the clearing out of the purulent secretions by aspiration with the aspirating bronchoscope and the independent aspirating tube, the latter being inserted into passages too small to enter with the bronchoscope, and the endobronchial instillation of from 10 to 30 cc. of the medicament. The following have been used: Argyrol, 1 per cent watery solution; Silvol, 1 per cent watery solution; Iodoform, oil emulsion 10 per cent; Guaiacol, 10 per cent solution in paraffine oil; Gomenol, 20 per cent solution in oil; or a bismuth subnitrate suspension in oil. Robert M. Lukens and William F. Moore of the Bronchoscopic Clinic report excellent results in post-tonsillectomy abscesses from one tenth of one per cent phenol in normal salt solution with the addition of 2 per cent Lugol's solution. Chlorinated solutions are irritating, and if used, require copious dilution. Liquid petrolatum with a little oil of eucalyptus has been most often the medium. _Gangrene of the Lung_.--Pulmonary gangrene has been followed by recovery after the endobronchial injection of oily solutions of gomenol and guaiacol (Guisez). The injections are readily made through the laryngoscope without the insertion of a bronchoscope. A silk woven catheter may be used with an ordinary glass syringe or a long-nozzled laryngeal syringe, or a bronchoscopic syringe may be used. _Lung-mapping_ by a roentgenogram taken promptly after the bronchoscopic insufflation of bismuth subnitrate powder or the injection of a suspension of bismuth in liquid petrolatum is advisable in most cases of pulmonary abscess before beginning any kind of treatment. _Bronchial Stenosis_.--Stenosis of one or more bronchi results at times from cicatricial contraction following secondary infection of leutic, tuberculous or traumatic lesions. The narrowing resulting from foreign body traumatism rarely requires secondary dilatation after the foreign body has been removed. Tuberculous bronchial stenoses rarely require local treatment, but are easily dilated when necessary. Luetic cicatricial stenosis may require repeated dilatation, or even bronchial intubation. Endobronchial neoplasms may cause a subjacent bronchiectasis, and superjacent stenosis; the latter may require dilatation. Cicatricial stenoses of the bronchi are readily recognizable by the scarred wall and the absence of rings at or near the narrowing.