vi Preface 



Dr. A. Hollaender and Professor A. Haddow made these 

 points when approaching the Director late in 1954 with a 

 request that a symposium on the Influence of Ionizing 

 Radiations on Cell Metabolism should be included in the Ciba 

 Foundation's programme. The Director readily agreed, sub- 

 ject to receiving their expert advice on its organization, in 

 which they were later most helpfully joined by Professor 

 J. A. V. Butler and Dr. L. H. Gray. 



The symposium, which was realized in March 1956, and 

 which was held under the skilful and kindly chairmanship of 

 Professor Haddow, is amply recorded in this book. The 

 Editors hope that their intervention has to some extent made 

 for easier reading, but that the reader will be able to enjoy, as 

 if he were a participant, the efforts made by the contributors 

 on this friendly occasion to bring forward new information and 

 to come to an understanding of each other's aims, methods, 

 problems and interpretations. 



