53 



POPULAR SCIENCE MONTHLY 



Transformation Products of Thorium, Actinium and Radium according to 



Rutherford 



while the emanation underwent a change into argon. The lithium, we 

 are assured, could not be found in the original materials ; it represents 

 about .01 per cent, of the sodium and calcium found in the same experi- 

 ment ; its actual amount, after correcting a slight oversight in Eamsay's 

 estimate, would be 0.00000003 gram. For such a quantity the amount 

 of copper transformed would be too minute for the detection of a loss 

 from the 0.3 gram of copper which the original solution may be assumed 



