In previous communications, 1 the technic of inhalation anesthesia described suggested the following considerations: It was stated by Dr. Chevalier Jackson that intubation by the method advocated was nontraumatic, Dr. Jackson's opinion being, "There is no reaction of any consequence in an operation as long as two hours. There is vastly more reaction from the bubbling back and forth of ether laden mucous when ether is given by the open-drop method." The disadvantages of direct laryngoscopy and the presence of the tube were believed to be counterbalanced by the simplicity of the equipment providing an operative field free from escaping anesthetics, an uninterrupted normal respiration, conservation of carbon dioxide, exclusion of foreign matter, such as blood, vomitus, mucus, etc., complete control of a lightly anesthetized patient, functioning facilities for artificial respiration, protection of the trachea from external pressure, an aseptic operative field and a means whereby any anesthetic