COLLABORATING EDITORS 



Janet Howell Clark, Associate Professor of Physiology, School 

 of Hygiene and Public Health, The Johns Hopkins University, 

 Baltimore 



Kenneth S. Cole, Assistant Professor of Physiology, College of 

 Physicians and Surgeons, Columbia University, New York 

 City 



Farrington Daniels, Professor of Chemistry, University of 

 Wisconsin, Madison 



GiOAccHiNO Failla, Physicist, Memorial Hospital, New York 

 City 



Charles Packard, Assistant Professor of Zoology, Institute of 

 Cancer Research, Columbia University, New York City 



Henry W. Popp, Associate Professor of Botany, Pennsylvania 

 State College, State College 



