. Effects of the rays of radium on plants . Fk9. 69. Oiiagra biennis. Asymmetrical Rosette. The Ovary was exposed before Pollination for four Days to the Rays from a Radium-coated Rod of 10,000 Activity; Pollen not exposed. Cf. figures 67, 68, and 70. ruary, 1907. In no instance was germination completely inhibited by the radium treatment; that is, there was no case observed of fail- ure of any considerable number of seeds to germinate. The per- centage of germination seemed unaffected in any instance, though tSee Shull,i3p. 256.

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