Public Health Monographs 
edited and issued by Public Health Reports 
G. St.J. Perrott 
Chief, Division of Public Health Methods 
Managing Director 
Marcus Rosenblum 
Acting Executive Editor 
Taft S. Feiman 
Managing Editor 
Janet V. Easdale 
Monograph Editor 
BOARD OF EDITORS 
Edward G. McGavran, M.D., 
Chapel Hill 
Gaylord W. Anderson, M.D., Dr. P. H. 
Minneapolis 
Justin M. Andrews, Sc.D., LL.D. 
Washington 
H. Trendley Dean, D.D.S. 
Chicago 
Halbert L. Dunn, M.D., Ph.D. 
W ashington 
Martha M. Eliot, M.D., Sc.D. 
Washington 
Harold M. Erickson, M.D., M.P.H. 
Portland , Oregon 
M.P.H. , Chairman 
Lloyd Florio, M.D., Dr.P.H. 
Denver 
Ruth Freeman, R.N., Ed.D. 
Baltimore 
Victor H. Haas, M.D. 
Bethesda 
Basil C. MacLean, M.D., M.P.H. 
New York City 
Seward E. Miller, M.D. 
Washington 
M. Allen Pond, M.P.H. 
W ashington 
U. S. DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE 
Oveta Culp Hobby, Secretary 
PUBLIC HEALTH SERVICE 
Leonard A. Scheele, Surgeon General 
