14 71 



CONTENTS 



Preface vii 



1. Photochemistry ] 



Robert Livingston, Professor of Physical Chemistry, University of Minne- 

 sota, Minneapolis 



2. Practical Applications and Sources of Ultraviolet Energy ... 41 



L. ./. Bvitolph, Engineer, General Electric Company, Lamp Division, 

 Cleveland, Ohio 



3. Sunlight as a Source of Radiation 95 



./. .4. Sanderson, Superintendent Optics Division, Xaval Research Labor- 

 atory, Washington, D.C. 



Edward O. Hulhurt, Director of Research, Xaval Research Laboratory, 

 Washington, D.C. 



4. Technique of Study of Biological Effects of Ultraviolet Radiation 119 



Jesse F. Scott, Associate in Biophysics, Massachusetts General Hospital, 

 Boston; and Research Associate, Department of Biology, Massachusetts 

 Institute of Technology, Cambridge 



Robert L. Sinsheimer, Associate Professor of Biophysics, Physics Depart- 

 ment, Iowa State College, Ames 



5. Ultraviolet Absorption Spectra 165 



Robert L. Sinsheimer (see Chap. 4) 



6. A Critique of Cytochemical Methods 203 



A. W. Pollister, Professor of Zoology, Columbia ITniversity, New York 

 City 



7. The Effect of Ultraviolet Radiation on the Genes and Chromo- 

 somes OF Higher Organisms 249 



C. P. Swanson, Professor of Botany, Johns Hopkins University, Balti- 

 more, Maryland 



L. J. Stadler, Professor of Field Crops, University of Missouri, and Agent, 

 U.S. Department of Agriculture, Columbia 



8. The Effects of Radiation on Protozoa and the Eggs of Inverte- 

 brates Other than Insects 285 



Richard F. Kimball, Senior Biologist, Biology Division, Oak Ridge 

 National Laboratory, Oak Ridge 



9. Radiation and Viruses 333 



S. E. Luria, Professor of Bacteriology, University of Illinois, Urbana 



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