EXPOSED WATER AND FRESHLY FALLEN RAIN 1 79 



ning, and corn slightly. In this experiment the soaking of bean 

 seeds in irradiated water was followed by decided acceleration at 

 first, but the effect was not lasting, for the control plants eventually 

 attained the same height as those soaked in the exposed water. 



After seeds of Lupmus albus had germinated, further growth in 

 length of the radicles was retarded in water previously exposed for 

 24 hrs. to radium rays of activities of from 10,000 to 1,800,000. 



When dry seeds of corn and lupine were planted in soil, and 

 watered with water exposed for from one to nine days to rays from 

 radium of 1,800,000 x , the growth of the corn was less and that of 

 the lupines greater than of plants watered with fresh tap-water, but 

 otherwise similarly treated. 



The rate of growth of roots of Lttpimis albtts is less in freshly 

 fallen rain-water than in rain-water one month old or in artificially 

 distilled water. This effect is similar to that produced by placing a 

 sealed glass tube of radium into water in which roots are growing 

 (figure 41), and the retardation is attributed, either directly or in- 

 directly, to the radioactivity of the fresh rain. 



