. Effects of the rays of radium on plants . Fig. 24. Experiment 32. Acceleration of Germination and Growth of Oats bj Placing a Sealed Glass Tube of Radium (1,500,000 X) '" the Soil. The Glass Tube in C is Empty. Cf. figures 8, 25, and 26. from the center of the pot. The sealed glass tube of RaBrj (1,500, 000 x) was inserted in the soil at the center of the pot, with the end containing the radium at a depth of about 15 mm. below the surface. Control culture similarly arranged, but with empty tube. 135

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