List of Contributors 



G. E. Blackmail, Department of Agriculture, Oxford University, Eng- 

 land 

 James Bonner, Division of Biology, California Institute of Technology 

 jean Bracket, Faculte des Sciences, Universite Libre de Bruxelles, 



Belgium 

 Armin C. Braiin, The Rockefeller Institute, New York City 

 Seymour S. Cohen, Department of Biochemistry, School of Medicine, 



University of Pennsylvania 

 Francis H. C. Crick, Department of Physics, Cavendish Laboratory, 



University of Cambridge, England ' 

 Pierre Dansereau, Botanical Institute, University of Montreal; now 



Assistant Director, New York Botanical Garden 

 Victor A. Drill, Director, Division of Biological Research, G. D. Searle 



& Company, Chicago 

 Harriett Ephrtissi-Taijlor , Laboratoire de Genetique Physiologique du 



Centre National de la Recherche Scientifique, Gif-sur-Yvette, 



France 

 H. Orin Halvorson, Department of Bacteriology, University of Illinois 

 Sir John Hammond, School of Agriculture, University of Cambridge, 



England 

 Mahlon B. Hoagland, John Collins Warren Laboratories, Huntington 



Memorial Hospital, Harvard University 

 Hans Jenny, Department of Soils and Plant Nutrition, University of 



California, Berkeley 

 Thomas H. Jukes, Agricultural Division, American Cyanamid Com- 

 pany, New York City 

 Ancel Keys, Director, Laboratory of Physiological Hygiene, University 



of Minnesota 

 Ernst Knobil, Department of Physiology, Harvard Medical School; now 



Department of Physiology, University of Pittsburgh School of 



Medicine 



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