478 RADIATION BIOLOGY 



Wey, H. G. van der (1929) tJber die phototropische Reaktion von Pilobolus. Proc. 



Koninkl. Ned. Akad. Wetenschap. Amsterdam, 32: 65-77. 

 Wilden, M. (1939) Zur Analyse der positiven und negativen phototropischen 



Kriimmungen. Planta, 30: 286-288. 

 Wildman, S. G., and J. Bonner (1948) Observations on the chemical nature and 



formation of auxin in the Arena coleoptile. Am. J. Botany, 35: 740-746. 

 Yin, H. C. (1938) Diaphototropic movement of the leaves of Malva neglecta. Am. 



J. Botany, 25: 1-6. 



Manuscript received by the editor Apr. 1, 1952 



