Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 EFFECTS OF EXPOSING SEEDS 131 Experiment 30 Object: To see if a variation in the time-interval between the exposure of seeds to radium-rays and their germination, alters the efficacy of the exposure to affect germination. November 19, 10 A. M. Three sets of six seeds each of Lit^imis albus, treated as follows, were planted without soaking, in soil in flower pots. 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
Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 EFFECTS OF EXPOSING SEEDS 131 Experiment 30 Object: To see if a variation in the time-interval between the exposure of seeds to radium-rays and their germination, alters the efficacy of the exposure to affect germination. November 19, 10 A. M. Three sets of six seeds each of Lit^imis albus, treated as follows, were planted without soaking, in soil in flower pots. 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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Photo credit: © Bookend / Alamy / Afripics
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