ii6 



EFFECTS OF EXPOSING SEEDS 



All the plants exposed to the radium of 1,500,000 x have failed 

 to become erect, and grow horizontally over the surface of the 

 ground (figure 14). 



Fig. 14. Experiment 26. Absence of Geotropic Response in Shoots of Zea Mays, 

 following a 24 Hours' Exposure of the Grains, before Planting, to Radium of i, 500,000 X- 

 From left to right, RaBr^ 1,800,000 X; RaBr2 1,500,000 X i Ra. Tel.; Control. 

 Cf. FIGURE 62. 



On June 4, the culture exposed to the radio-tellurium was photo- 

 graphed with the control set (figure 15). 



Exposure for 33 Hours 

 The heights of the seedlings above the surface of the soil are as 

 follows : 



