This Symposium was undertaken by the National Academy of Sciences — National 

 Research Council as a result of discussions with the Research and Development 

 Division, Office of the Surgeon General, U. S. Army. The costs of the meeting 

 were defrayed jointly by the Army, Navy and Air Force, and the Army contributed 

 additional funds to support publication of these Proceedings. 



The Symposium was organized and conducted under the auspices of four sub- 

 committees of the Committee on Medicine and Surgery, in the Academy-Research 

 Council's Division of Medical Sciences — the Subcommittee on Anesthesia, the Sub- 

 committee on the Cardiovascular System, the Subcommittee on Shock, and the Sub- 

 committee on Trauma. 



Dr. R. D. Dripps served as Chairman of a planning conference on 21 March 1955, 

 as well as of the Symposium, and also as editor-in-chief of these Proceedings. 

 Lt. Col. W. H. Crosby. Jr.. and Drs. M. E. De Bakey, A. H. Hegnauer, F. J. Lewis, 

 F. D. Moore, and W. H. Muller, Jr., presided at various sessions of the Symposium. 

 In the Division of Medical Sciences, stafif responsibility was borne chiefly by 

 Lt. Cdr. C. D. West, who organized the Svmposium under the guidance of 

 Dr. I\L H. Sloan and Dr. Thomas Bradley, and by Dr. D. E. Copeland, who as- 

 sembled and prepared the manuscript for Dr. Dripps. Mr. Frank M. Holz was 

 retained to complete the final editing of the Proceedings and prepare thetu for 

 publication. 



Some regrouping of the papers was found desirable. The discussions have also 

 l)een rearranged and much condensed. A brief report by Capt. T. G. Barila con- 

 cerning work then in progress was later withdrawn at his own request. Since the 

 work of Drs. R. K. Andjus. J. E. Lovelock, and A. U. Smith was presented chiefly 

 bv means of a motion picture, a summary of tlie film and relevant addena were 

 submitted after the Symposium. The five articles of Review and Appraisal were 

 also prepared subsequent to the meeting. 



LIBRARY OF CONGRESS CARD CATALOG NO. 56-60045 



