C. H. WADDINGTON of the University 

 of Edinburgh is Director of the Agricul- 

 tural Research Council's Unit of Animal 

 Genetics. For his embryological studies 

 he received the Albert Brachet Prize from 

 the Royal Academy of Belgium. Some of 

 his books are Introduction to Modern 

 Genetics; Organisers and Genes; The Sci- 

 entific Attitude; Epigenetics of Birds; 

 Principles of Embryology; The Strategy 

 of Genes; The Ethical Animal; and The 

 Nature of Life. Professor Waddington is 

 a Fellow of the Royal Society. 



