PREFACE 



This second volume of "Radiation Biology" covers the 

 field of ultraviolet radiation. It also contains considerable 

 material on high-energy radiation. Since both parts of the 

 spectrum induce similar biological effects, no clear line can be 

 drawn between the two. Microbiology, for example, is dis- 

 cussed in both volumes but occupies a more prominent place 

 in the second. Actually, Volume I and Volume II compose a 

 unit and should be read as such. 



Alexandek Hollaender 



vu 



