Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 204 EFFECTS ON PLANT RESPIRATION These readings indicate, as in the preceding experiments, a re- tardation of respiration hy the radium of 1,500,000 activity, but the volumes of gas evolved by the seeds exposed to radium of 10,000 activity and to radio-tellurium exceed the volume given off by the control seeds- bo i 2 ^ Summary When a sealed glass tube containing .52 gm. of radium bromide of 10,000 X is laid over, and in contact with soaked wheat grains placed to germinate, an acceleration of respiration results,
Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 204 EFFECTS ON PLANT RESPIRATION These readings indicate, as in the preceding experiments, a re- tardation of respiration hy the radium of 1,500,000 activity, but the volumes of gas evolved by the seeds exposed to radium of 10,000 activity and to radio-tellurium exceed the volume given off by the control seeds- bo i 2 ^ Summary When a sealed glass tube containing .52 gm. of radium bromide of 10,000 X is laid over, and in contact with soaked wheat grains placed to germinate, an acceleration of respiration results, but no effect could be detected when the grains were similarly exposed to radio-tellurium in a sealed glass tube. A like exposure to rays from 5 mg. of radium bromide of 1,500,000 x also resulted in an acceleration of respiration, but not to so great a degree as was caused by the preparation of 10,000 activity. If the grains were exposed dry, before soaking, for 54 hrs. to rays from the radium of 1,500,000 x , their respiration was at first retarded, but this was followed by recovery and marked acceleration.
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