X PARTICIPANTS 



Nathan Kaliss, Ph.D. 



Roscoe B. Jackson Memorial Laboratory, Bar Harbor, Maine 



George Klein, M.D. 



Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden 



Joshua Lederberg, Ph.D.* 



Department of Genetics, Stanford University, Palo Alto, California 



Edwin P. Les, Ph.D. 



Roscoe B. Jackson Memorial Laboratory, Bar Harbor, Maine 



Clarence C. Little, M.D. 



Littlehaven, Ellsworth, Maine 



Clara J. Lynch, Ph.D. 



Rockefeller Institute for Medical Research, New York, New York 



W. B. Mcintosh, Ph.D. 



Department of Zoology, Ohio State University, Columbus, Ohio 



Andrew V. Nalbandov, Ph.D. 



Department of Animal Science, University of Illinois, Urbana, Illinois 



Ray D. Owen, Ph.D.* 



Division of Biological Sciences, California Institute of Technology, Pasadena, 

 California 



H. Ira Pilgrim, Ph.D. 



Department of Surgery, University of Utah, Salt Lake City, Utah 



Raymond A. Popp, Ph.D. 



Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 



T. Edward Reed, Ph.D. 



Departments of Zoology and Pediatrics, University of Toronto, Toronto, 

 Canada 



Charles M. Rick, Jr., Ph.D.* 



Department of Vegetable Crops, University of California, College of Agricul- 

 ture, Davis, California 



