Re a + 

 infrared 



Blue - 



Green 



Hed 



Red + 

 infrared 



Fig. 2. Formative and flowering efi^ects on Hyoscyamus niger, annual 

 strain in various spectral regions of light at difi'erent GA concentrations 

 (/-tg/plant/day). Experiment 2 (Curry and Wassink, 1956), photo- 

 graphed Sept. 3, 1956, after 30 days. (Rearranged from Curry and Was- 

 sink, 1956, plate 2c.) 



114 



