Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 122 EFFECTS OF EXPOSING SEEDS October 22, 10 A. M. Three sets of six dry seeds each, A, B, and C, were exposed as follows, to the rays from 10 mg. of RaBr^, 1,800,000 activity, in a sealed glass tube : A. 72 hrs. Planted 4 days after the end of the exposure. B. 50 hrs. ' 2 ' ' ' ' ' ' C. 26 hrs. ' 21 hours ' ' ' ' ' D. Control, not exposed. The seeds were then planted without soaking, in separate pots in soil. Fig. 19. Expei-iment 27. Effect of Duration of Exposure to Radium Rays on Germina
Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 122 EFFECTS OF EXPOSING SEEDS October 22, 10 A. M. Three sets of six dry seeds each, A, B, and C, were exposed as follows, to the rays from 10 mg. of RaBr^, 1,800,000 activity, in a sealed glass tube : A. 72 hrs. Planted 4 days after the end of the exposure. B. 50 hrs. ' 2 ' ' ' ' ' ' C. 26 hrs. ' 21 hours ' ' ' ' ' D. Control, not exposed. The seeds were then planted without soaking, in separate pots in soil. Fig. 19. Expei-iment 27. Effect of Duration of Exposure to Radium Rays on Germination and Growth of Lupinus albus. Length of Exposures, from Left to Right, 72 Hours, 50 Hours, 26 Hours, Control. Cf. figure 20. The lengths of the hypocotyls above the surface of the soil were measured as follows : Oclob er 29, A 10 A. M. B 72 h rs. 50 hrs. 1 mm . mm 2 3 4 4-50 5 just up * 6 T mm. mm. mm. mm. Poor seed. Discarded. c 26 hrs. mm. mm. mm. D Control mm. mm. mm,
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