EXPOSED WATER AND FRESHLY FALLEN RAIN 



171 



Experiment 51^ 

 In order to ascertain the effect on the growth of roots in water of 

 placing a sealed glass tube of radium bromide in the water, two glass 

 beakers were partly filled with tap-water. Into the water of each 



5 6 



48 



40 



I 24 

 16 



..Experimetit 51. 

 Effect on germination atid growth 

 of water exposed to radium rays. 



Lupinus albtis. 



-7 



3 4 



Day of month 



Fig. 39. 



3 4 



Day of month 



Fig. 40. 



