NUCLEAR FISSION — D ARROW 159 



them achieve fissions. Perhaps on the other hand the brakes are easier 

 to relax than the foregoing words imply. Possibly they can be relaxed 

 just a little without letting go altogether, and then there may be avail- 

 able a potent source of power. But at this point I depart from the 

 traditional detachment of the scientist, and express the fervent hope 

 that the mastery of this process, if ever to be achieved at all, will not 

 be achieved until the world is ready to use it wisely. 



