EXPOSED WATER AND FRESHLY FALLEN RAIN 



i6s 



The average heights of the seedlings were as follows on the 

 dates indicated : 



Experiment 50 

 Object : To ascertain the effect on the growth in length of the 

 radicles of Lupinus albiis of soaking in water in which sealed glass 

 tubes of radium bromide have been immersed. 



May 5, 12 :3o P. M. 



Into each of four beakers containing 100 c.c. of tap-water was 

 placed a sealed glass tube of radium bromide, as follows: 



A. Activity 1,800,000. 



B. Activity 1,500,000. 



C. Activity 10,000. 



D. Control. 



After the water had been exposed for 24 hours to the radium 

 rays, the hypocotyls of germinated seeds of lupine were suspended 



'Discarded. 



