Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 242 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM eration of growth on one side. Evidence warranting this interpre- tation is wanting in the case of the two rosettes first described. Asymmetry of the rosettes is not unknown in other species of the evening-primrose without special antecedent treatment,* but its fre- quency in the radium-cuhures, and more especially the subsequent behavior of the asymmetrical plants, and which is lacking in unex- Fig. 70. Onagra biennis. Functionally Asymmetrical Rosette from a
Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 242 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM eration of growth on one side. Evidence warranting this interpre- tation is wanting in the case of the two rosettes first described. Asymmetry of the rosettes is not unknown in other species of the evening-primrose without special antecedent treatment,* but its fre- quency in the radium-cuhures, and more especially the subsequent behavior of the asymmetrical plants, and which is lacking in unex- Fig. 70. Onagra biennis. Functionally Asymmetrical Rosette from a Seed whose Ovary was exposed for 53 Hours after Pollination to Rays from Radium of 10,000 Activity in a sealed Glass Tube. The Cauline Stem is beginning to grow horizontally, leaning toward the narrower Portion of the Rosette. posed specimens, seems to justify the inference that, in these in- stances the asymmetry is a result of the exposure to the radium rays. This subsequent behavior is illustrated in figure 70, which is a * MacDougal,* figure 13. A hybrid between O. Lamarckiana and O. biennis.
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