. Effects of the rays of radium on plants . 0 2 S 4 5 6 T 8 Days Fig. 34. Effect on the Germination and Growth of Oat of soaking the Grains in Water exposed for Hours, to Rays from Radium of different degrees of activity. On April 23 the average height of the seedlings of the 1,500,000 culture was mm., of the 10,000 culture mm., and of the

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