EFFECTS OF EXPOSING SEEDS 



97 



Experiment 14 

 May 25, 12 M. 



Eight dry seeds of the bean {Phaseolus. Henderson's " Long 

 Yellow, Six Weeks") were placed in moist sphagnum with their 

 hilum-edges touching a rod coated with RaBrg (10,000 x ). Con- 

 trol, similarly placed, but with no radium. Rod continued through- 

 out the experiment. 



t "^ ^ ^ ^ *|r -^ # 



Fig. 7. Experiments 14 (Bean) and 17 (Lupine). Germination Retarded by Ravs 

 from Coated Rods of 10,000 X (Bean), and 25,000 X (Lupine). 



May 27, 3 P. M. 



The radicles have protruded in one radiated seed, and in seven 

 of the control seeds. 



May 28, 10 A. M. 



The seeds were photographed with those of Experiment 17 (fig- 

 ure 7). 



