EFFECTS OF RADIOACTIVE AIR ON GROWTH I53 



Measurements of the growth in length of radicles were made as 

 follows : 



Control 

 13.00 mm. 

 10.00 

 14.50 

 10.50 

 12.50 



63.50 mm. 

 12.70 mm. 



Exposure to the emanation has been followed by a decided accel- 

 eration in growth. 



May I, 12 M. 



A repetition of the above experiment was started, using six seeds 

 of Lu^imis albus in each culture. 



May 2, 12 M. 



Measurements of growth were recorded as follows : 



Radium Control 



1 13.50 mm. 10.00 mm. 



2 14.50 10.00 



3 11.50 10.00 



4 17.50 10.00 



5 19.00 10.00 



6 19.00 10.00 



95.00 mm. 60.00 mm. 



15.83 mm. 10.00 mm. 



