ACKNOWLEDGMENTS 



I am greatly indebted to the following for providing the excellent 

 photographs reproduced in this book: my colleagues, Messrs E. J. 

 Ambrose, M. S. C. Birbeck, Drs O. G. Fahmy, E. H. Mercer and 

 S. H. Revell and Professor P. KoUer, of the Chester Beatty Research 

 Institute; Dr J. C. Kendrew of the mrc Unit for Molecular Biology, 

 Cambridge; Professor J. Z. Young, Dr H. E. Huxley and Dr D. Sholl 

 of University College, London; Dr F. Sjostrand of the Department of 

 Anatomy, Karolinska Institute, Stockholm; Dr R. W. G. Wyckoff; 

 and Professor F. Jacob of the Institut Pasteur, Paris. The following 

 gave me permission to use hne drawings: Dr Lorente de No and the 

 Oxford University Press; Dr W. F. Floyd of the Middlesex Hospital 

 Medical School; Professor G. W. Beadle and Professor G. A. Baitsell 

 and the University Presses of Oxford and Yale. I am indebted to The 

 Pergamon Press for the loan of a block. 

 To all I tender my sincere thanks. 



J.A.V.B. 



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