Publication was supported in part by 

 Public Health Service Research Grant M-464S from 

 the National Institute of Mental Health, 

 Public Health Service. 



Copyright ©, 1961 



The Williams & Wilkins Company 



Made in the United States of America 



Library of Congress 

 Catalog Card Number 

 60-12279 



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WAVrCRLV PRKSS, INC. 



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