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CIBA FOUNDATION 

 COLLOQUIA ON AGEING 



VOLUME 3 

 Methodology of the Study of Ageing 



Editors for the Ciba Foundation 

 G. E. W. WOLSTENHOLME, O.B.E., M.A., M.B., B.Ch. 



and 

 CECILIA M. O'CONNOR, B.Sc. 



With 47 Illustrations 



LITTLE, BROWN AND COMPANY 



BOSTON 



