RADIOACTIVE MATTER 459 



impossible, without some such hypothesis, to correlate geologic 

 time with the duration of solar heat. Other lines of thought 

 lead to the same idea. But it is impossible to deal with remote 

 implications in a brief note. In view of current scientific views, 

 I think it desirable to publish the idea for what it is worth, and 

 to indicate the origin of the first suggestion of the kind I have 

 been able to discover. 



