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I 



□le 



PATH of 



CIENCE 



v^v 



,-./^ 



By 



C. E. KENNETH MEES, D.Sc, F.R.S. 



Vice President in charge of Research 



Eastman Kodak Company 



Rochester, New York 



with the co-operation of 

 JOHN R. BAKER, M.A., D.PhiL, D.Sc. 



Lecturer in Zoology in the 

 University of Oxford, England 



New York: JOHN WILEY & SONS, Inc. 

 London: CHAPMAN & HALL, Limited 



