. Effects of the rays of radium on plants . 11 12 Day of month Fig. 10. Effect on the Growth of Zea Mays of Exposing the Grains, before Plant- ing, for 16 Hours, to Raj'S from Radium of Different Degrees of Activity. exposed while germinating for 18 hrs. (10,000 x ), and planted in soil, the tap-roots grew very abnormally. After 16 days' growth in the soil the tap-roots had evidently ceased growing, and, correlated with this fact, the secondary roots had developed more vigorously than normally. Oat grains were exposed for 67 hrs. after being soaked in water, and then planted in soil. The subse
. Effects of the rays of radium on plants . 11 12 Day of month Fig. 10. Effect on the Growth of Zea Mays of Exposing the Grains, before Plant- ing, for 16 Hours, to Raj'S from Radium of Different Degrees of Activity. exposed while germinating for 18 hrs. (10,000 x ), and planted in soil, the tap-roots grew very abnormally. After 16 days' growth in the soil the tap-roots had evidently ceased growing, and, correlated with this fact, the secondary roots had developed more vigorously than normally. Oat grains were exposed for 67 hrs. after being soaked in water, and then planted in soil. The subsequent growth of the shoots was ?Bibliography, p. 72, No. 39.
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