Department of Surgery (Anesthesiology), Stanford University Hospital, San Francisco, Calif. Received for publication February 25, 1949. *Read before the Section on Anesthesiology at the 76th Annual Session of the California Medical Association, San Francisco, Calif. April 11–14, 1948. **These were supplied for these studies by the Department of Clinical Research of Winthrop-Stearns, Inc.
