ipS 



EFFECTS ON PLANT RESPIRATION 



Time 



(Sept. 19) 



9:30 



10:30 



II 130 



Readings of the Scale^ multiplied by 10 



RaBr^ Amt. of RaBr^ Amt. of Amt. of Temp. 



1,500,000 Change 10,000 Change Control Change 



12 

 I 



2 

 3 



30 

 30 

 30 

 30 



4:30 

 5:30 

 (Sept. 20) 

 8:30 



9-45 



9-05 

 S.60 



8.32 



8.10 



7.90 



7.70 



7-50 

 7-30 



Total, 3.05 

 4-25 



0.40 



0-45 

 0.28 

 0.22 

 0.20 

 0.20 

 0.20 

 0.20 



5-^5 

 Total in 23 hrs. = 8.20 



9-35 

 8.95 



8.55 

 8.22 



8.00 



7.70 



7-45 

 7.17 

 6.85 



2.60 



0.40 

 0.40 



0-33 



0.22 



0.30 

 0.25 

 0.28 

 0.32 



4-25 

 6.75 



9-30 

 8.95 



S.60 



8.33 

 8.15 



7-95 

 7.70 



7-50 

 7-30 



4.40 



11.00 



0-35 



0-35 

 0.27 



0.18 



0.20 



0.25 



0.20 



0.20 



2.90 



4-90 

 7.80 



°C. 



25 



25 



25 



25 



25-75 



25-75 



26 



26 

 26 



26 



The total amount recorded of CO2 evolved in 8 hours is 3.05 

 units, following exposure to the rays from the salt of activity 

 1,500,000; 4.25 units following exposure to the rays from the salt 





^ 



1 2 3 4 5 6 7 .& 



Hours 



Fig. 50. Acceleration of Respiration of germinating Wheat by Radium Rays. 



of 10,000 activity, and 2.90 units in the control. During the last 

 15 hours of the experiment, 5.15 units were recorded following ex- 

 posure to the radium of stronger activity; 6.75 units following ex- 

 posure to the radium of weaker activity, and 4.90 units in the control. 

 The total amounts evolved during 23 hours were recorded respect- 

 ively as follows : 8.20 units; 11.00 units; 7.80 units. 



