io6 



EFFECTS OF EXPOSING SEEDS 



January 19, 9 A. M. 



Radiutn 

 67.00 mm. 

 60.50 

 36.00 

 70.00 

 57.00 



54-50 



Control 

 69.50 mm, 

 76.50 



30.50 

 64.50 



73-50 

 45.00 



4S3.50 mm. 



Average of 6, 80.58 4- mm. 



79.00 



554.00 mm. 

 Average of 7, 79.14 4- nim. 



Germination and growth were at first retarded, following exposure 

 to the radium, but after ten days (January 21-22) the exposed and 

 the control seedlings are of practically the same length. 



Experiment 24 

 February 26, i P. M. 



Six seeds of Ltifimis albus were soaked in water for 18 hrs. and 

 after the removal of the seed coats, were placed to germinate in a 

 Zurich germinator in two rows, with the hilum-edges in contact, 

 and a sealed glass tube of RaBrj (10,000 x ), with the radium salt 

 evenly distributed over the bottom of the tube was placed lengthwise 

 over the hypocotyls, and in contact with them. 



Five control seeds were similarly placed with an empty tube. 



March i, 5 : 30 P. M. 



The seeds have all germinated in both cultures, with hypocotyls 



