Vernalization 



AND PhOTOPERIODISM 



Plate 1 

 to face p. vii 



Anton Hendrik Blaauw (17 Sept. 1882-11 Nov. 

 1942). for many years Professor of Plant Physiology, 

 College of Agriculture. Wageningen. the Netherlanck.- - 

 Frontispiece of \V. H. Arisz's biography in Jaarb. 

 Nederl. Akad. Wetcnsch. 1941/42. 



Hakrv Ardkli. Allakd ( /'. 1H8U). formerly Senior 

 Physiolugisl, I)iv. of Tobacco Investigations. Rurean of 

 Plant Industry Station, U. S. Dept. of Agriculture, 

 retired since Sept, 1946. 



WionTMAN Wells Garner (h. ISTS), formerly Prin- 

 cipal Plant Physiologist, Div. of Tobacco Investigations, 

 liureaii of Plant Industry Station of the U. S. Dept. of 

 Agriculture. Heltsville, Maryland. 



Nikola J Grioorjevich Cholodny (b. 1882). 

 Ukrainian plant physiologist, who survived the war 

 years and continues his work at Kiev.- -After a painting 

 by Streblov (based on a photograph), courtesy of Mrs. 

 Harvey. 



