PREFACE 



Sir Hans Krebs refers in his opening address to the 

 origins of this symposium. It will be clear to readers that in 

 addition to being largely responsible for initiating it, he 

 greatly influenced its organization and, as Chairman, its 

 course. For his encouragement and wise counsel the Director 

 of the Foundation is deeply indebted — an increase in personal 

 and professional indebtedness which goes back to the Director's 

 undergraduate days at Cambridge. 



Gratitude is also due in full measure to Professor Dickens, 

 who warmly supported the proposal of the symposium, and 

 gave valued assistance in its preparation. 



Although the Editors are accustomed to the task of pre- 

 paring for publication conference proceedings on very diverse 

 subjects, they are more conscious than ever on this occasion 

 that this book, by experts for experts, may clearly reveal their 

 deficiencies. If the final product is satisfactory, it will be 

 largely due to the ready co-operation of contributors, pub- 

 lishers, and Mr. William Hill, who compiled the index. It is 

 hoped that this work, as Sir Hans has suggested, will prove 

 to be a pioneer book of great value and importance in the 

 coming years. 



