EXPOSED WATER AND FRESHLY FALLEN RAIN l6l 



In the case of the lupines no appreciable effect was produced on 

 germination by soaking in the treated water, but subsequent growth 

 was slightly accelerated. 



With the corn, acceleration of growth followed the soaking in 

 the exposed water, but the rate of germination was apparently, in 

 the early stages at least, not affected. 



In the case of the oats, soaking in the treated water was followed, 

 for two days after the seeds came up, by a retardation of germina- 

 tion and of growth. Then the rate of growth of the exposed plants 

 increased. Acceleration was most rapid in the case of the plants 

 soaked in the water exposed to the stronger radium, and these plants 

 were taller than the control at the end of the fifth day after they 

 came up. At the end of 51 days this relatively greater height was 

 still marked, and the plants soaked in the water exposed to the 

 radium of 10,000 activity were also taller than the control. 



Part of the results of this experiment are shown graphically in 

 FIGURE 34. 



Experiment 49 



The following experiment shows the effect on the germination 

 and growth of corn grains {Zea Mays), bean seeds {Phaseolus), and 

 oats {Avena), of soaking, before planting, in water in which sealed 

 glass tubes of radium bromide had been immersed. 



April 23, 4 : 30 P. M. 



Into each of three beakers, a, b, and c, was placed 100 c.c. of 

 water, and into the water of each beaker was suspended a sealed 

 glass tube of RaBrg, as follows : 



Into a the RaBrg of 1,800,000 x . 



Into b the RaBrg of 1,500,000 x . 



Into c the RaBrg of 10,000 x . 



April 24, 4 : 30 P. M. 



After 24 hrs. exposure to the rays of the radium, the radium- 

 tubes were removed from the water, and 8 seeds each of corn, bean, 

 and oat were placed to soak in each beaker. Also in a control 

 beaker a like number of each kind. 



April 26, 8 : 30 A. M. 



After soaking for 40 hrs., the seeds were removed from the 

 water and planted in soil in flower-pots. Observations of germi- 

 nation and growth follow. 



