CHAPTER XIII 



EFFECTS OF RADIUM RAYS ON PLANT RESPIRATION 



I. Effect on Aerobic Respiration 



In order to test the effect of the raj^s of radium on plant respira- 

 tion, the following experiments were tried : 



Experiment 77 

 August 15. 



Into each of three tumblers, i, 2, and C, was placed a saturated 

 solution of KOH, and above this, on a moist blotter, supported by a 



24 

 22 



20 

 18 



16 

 .. 14 

 12 



bo 



10 



cc 



12 3 4 5 6 7 



Hours 



Fig. 4Q. 



piece of wire gauze, were placed grains of wheat {Triiicumy Hen- 

 derson's " Wellman Fife") weighing 2 gr. (dry weight). Over the 

 wheat and in contact with the grains were placed the radium-tubes 

 as follows : 



196 



