BY FREDERICK SOPPY, M.A. 



THE INTERPRETATION 

 OF RADIUM 



Fourth Edition, Revised and ILnlarged. 

 With Illustrations. 



THIS work gives in popular language an account 

 of radium, and describes how its unique properties 

 have been interpreted on the new theory of the 

 disintegration of its atoms, which invades so 

 many departments of thought. 



Spectator. " A most admirably conceived exposition 

 which does not seek merely to attract us by turning 

 marvels, at once outstripping our imagination and 

 humbling our conception, into cheap popular gazing- 

 stocks, but rather supports its unfailing charm by the 

 legitimate interests pointed here into a fascination that 

 may arrest even an habitually desultory reader of science 

 at once genuinely and delightfully taught." 



British Medical Journal. " We have endeavoured to 

 give a general idea of Mr Soddy's book in the hope that 

 it may induce many to read it, because it affords by an 

 orderly progression from the simple to the complex, and 

 with as little mathematics as possible, a clear idea of the 

 nature of the activity of radium, and the relation of that 

 astonishing element to others which precede and succeed 

 it in the process of disintegration or evolution." 



LONDON: JOHN MURRAY 



