THE ANESTHETIC is of graver importance in chest surgery than in operations elsewhere in the body. The mortality is very high during and following any extensive intrathoracic work.1 Willy Meyer's huge and costly differential pressure cabinets are well known and many complicated forms of apparatus for intratracheal anesthesia have been invented. Gwathmey2 states that “both the complicated differential pressure and the intratracheal methods have practically been largely eliminated.” There is certainly great need for a simple and safe method of anesthesia in thoracic surgery. The method to be described in this paper meets both the requirements of simplicity and safety.