xu CONTENTS 



11 Ionizing Radiation and Cellular Metabolism 189 



George Hevesy 



12 The Effect of Ionizing Radiations on Some Systems 



OF Biological Importance 216 



E. S. Guzman Barron 



13 Some Factors Influencing Cell Radiosensitivity 



BY Acting at the Level of the Primary Bio- 

 chemical Action 241 

 Raymond Latarjet 



14 On the Localization of Radiation Effects in 



Molecules of Biological Importance 259 



Martin D. Kamen 



15 Recent Evidence on the Mechanism of Chromo- 



some Aberration Production by Ionizing Ra- 

 diations 267 

 Norman H. Giles, Jr. 



16 Physical and Chemical Factors Modifying the 



Sensitivity of Cells to High-Energy and 

 Ultraviolet Radiation 285 



Alexander Hollaender 



17 Gene Mutations Caused by Radiation 296 



H. J. Muller 



18 Speculations on Cellular Actions of Radiations 333 



Raymond E. Zirkle 



19 The Dependence of Some Biological Effects of 



Radiation on the Rate of Energy Loss 357 



Cornelius A. Tobias 



20 The Influence of Quantity and Quality of Radia- 



tion on the Biologic Effect 393 



Titus C. Evans 



21 Some Physiological Factors Related to the Ef- 



fects OF Radiation in Mammals 414 



Hardin B. Jones 



22 Mammalian Radiation Genetics 427 



W. L. Russell 



23 Analysis of Mammalian Radiation Injury and 



Lethality 441 



Austin M. Brues and George A. Sacher 



