142 



EFFECTS OF RADIUM RAYS IN THE SOIL 



June 8. 



Heights of seedlings above the surface of the soil as follows : 



A 



i,Soo,ooo X 



1 41,50 mm. 



2 35.00 



3 44-50 



4 45 -oo 



5 47 -oo 



6 47.00 



7 38-00 



8 53-50 



9 53-50 



10 4500 



11 57.00 



12 37'Oo 



Av 



54.^.00 mm. 

 45.30 mm. 



Acceleration of growth has followed exposure to all the radio- 

 active substances. (See figure 27.) 



44 

 40 

 36 

 32 

 i 28 



Expenvieiit 38. 

 Acceleration of growth by radium 

 rays in the soil. 



5 6 



Day of month 

 Fig. 27. Triticum vulgare. 



/ 



"6- 



