EFFECTS OF RADIOACTIVE AIR ON GROWTH 



155 



May II, 5 : 30 P. M. (After 23 hours' exposure.) 



Radium Control 



20.00 mm. 14.00 mm. 

 25.00 17.00 



25.00 14.00 



21.00 12.00 



25.00 17.00 



20.00 15-00 



136.00 mm. 89.00 mm. 

 22.67 mm. i4'^3 ^'""^- 



Control 

 14.00 mm. 

 20.00 

 15.00 

 13.00 , . 

 19.00 

 i5v5o 



96.50 mm. 

 16.08 mm. 



The curves of growth given in figure 33 are typical of the results 

 obtained in all five experiments, which clearly indicate that the 



10 



11 



Days 



12 



Fig. 33. Acceleration of Growth of Roots of Lupinus albus in a Radio- 

 active Atmosphere. 



