140 



EFFECTS OF RADIUM RAYS IN THE SOIL 



Fig. 26. Experiment 36. Retardation of Germination and Growth of Oats by 

 Placing in the Soil a Celluloid Rod Coated with Lieber's Radium Coating. Cf. 

 FIGURE 24. 



was placed the sealed glass tube containing the RaBr^ (1,500,000 x ), 

 into the second (R') four rods coated with "Lieber's radium-coating" 

 25,000 X ), the third served as a control, with no radium. 



May 19, 5 P. M. 



The lengths of the hypocotyls above the surface of the soil were 

 as follows : 



C 



Control 

 114.00 miti. 



99-50 

 112.50 



91,50 

 112.00 



30.00 t 



89. 00 

 1 14.00 



762.50 mm. 



Average of 8: 86.875 Averageof7: 91.14 -f Average of 8 : 95.31 4- 

 mm. mm. mm. 



*To top of arch. tTo top of arch. Went bad. 



