. Effects of the rays of radium on plants . 0 1 2 3 4 5 6 7 Fig. 23. Lupinus albus. Duration of Exposure, 91-50 Hours. A. Exposed for 72 hrs. to RaBr21,500,000 x . Interval between exposure and planting, 6 days. B. Exposed for 72 hrs. to RaBr, 1,500,000 x . Interval between exposure and planting, 3 days. C. Exposed for 72 hrs. to RaBr, 1,500,000 x . Interval between exposure and planting, o days. D. Control, not exposed. Planted at same time as A, B, and C. Heights of the hypocotyls above the soil-surface as follows :

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