o6 EFFECTS OF EXPOSING SEEDS 



Radium Control 



6.00 mm. 18.50 mm. 



24.00 25.00 



9.00 30.00 



13.00 22.00 



21.00 



9.00 



8.00 30.00 



17.00 14.00 



12.00 25.00 



98.00 mm. 185.50 mm. 



Average of 8, 12.25 "'"^- Average of 8, 23.18 + mm. 



The amount of grow^th following exposure to the radium rays 

 during imbibition was only about one half the normal. 



Experiment 13 

 May 14, 4 P. M. 



Eight seeds of Liifimis albiis were placed on damp cotton in a 

 moist chamber in two rows of four seeds each, with the hilum-edges 

 of opposite seeds adjacent. Over the seeds was placed a radium- 

 coated rod (10,000 X ), in contact with the adjacent edges. 



Control of eight seeds in the same chamber with no rod. 



May 19, 9 A. M. 



All the seeds have germinated in both cultures, but the radicles 

 of the radiated seeds are shorter than those of the control seeds. The 

 exposed radicals are also noticeably more yellowish than are those 

 of the control. 



The lengths of the radicles are as follows : 



Radium Control 



41.00 mm. 41.00 mm. 



19.00 44.00 



12.00 22.00 



16.00 41.00 



17.00 41-50 



22.00 37-00 



30.00 26.00 



16.00 35 -oo 



173.00 mm. 287.50 mm. 



Average, 21.62 + mm. Average, 35.93 + mm. 



* Caught in seed-coat. 



