Or z; 



Photoperiodisni and Related Phenomena 

 in Plants and Animals 



Proceedings of the Conference on Photoperiodism, October 29- 

 November 2, 1957, sponsored by the Committee on Photo- 

 biology of the National Academy of Sciences — National Re- 

 search Council and supported by the National Science Foundation 



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o 



Edited by 

 ROBERT B. \^ ITHROW 



SMITHSONIAN INSTITUTION 



With the cooperation of 



ARTHUR C. GIESE 



CHARLES E. JENNER 



ALEXANDER HOLLAENDER 



N. E. TOLBERT 



C. S. PITTENDRIGH 



STERLING B. HENDRICKS 



Publication No. 55 of the 

 AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE 



Washington, D. C. 

 1959 



