PLATE 14 



PAGE. 



Onagra biennis. Radium culture No. 15a narrow leaf. The stigma 

 was pollinated with unexposed pollen after the ovary had been 

 exposed for 24 hours to the rays from radium bromide of 10,000 

 activity in a sealed glass tube ....... 250 



Fig. a, flower (minus corolla); b, petal; C, nearly mature capsule, 

 with bract (lateral branch) ; d, flower-bud, with bract (main 

 stem) ; e, foliage-leaf from main stem. 



