8 



THE INFLUENCE OF RADIUM ON THE 



was found that the rate of production of free iodine was much 

 affected by temperature, it was felt that an answer to the 

 question of whether radium radiations had a specific action of 

 their own on hydriodic acid, or only changed in degree the 

 action going on in their absence, was to be looked for from a 

 study of the action at different temperatures both with and 

 without the presence of radium. Further efforts at an explana- 

 tion of what is the action of external agencies such as impurity, 

 light, Becquerel rays, etc., will therefore be deferred until the 

 experiments on the effect of temperature on solutions with and 

 without radium have been detailed. 



The following table contains the results obtained with 

 water of a high degree of purity at a temperature of 24 C., both 

 with and without radium. A new sample of 50 cc. of hydriodic 

 acid solution was taken for each period of time shown. 



TABLE II. 



No. of cc. of ^ Na 2 S 2 O 3 solution required in titration 

 when decomposition of hydriodic acid solution takes place 

 in the dark in the presence of 



