[Illustration] The World Set Free by H.G. Wells We Are All Things That Make And Pass, Striving Upon A Hidden Mission, Out To The Open Sea. TO Frederick Soddy’s ‘Interpretation Of Radium’ This Story, Which Owes Long Passages To The Eleventh Chapter Of That Book, Acknowledges And Inscribes Itself Contents PREFACE PRELUDE. THE SUN SNARERS CHAPTER THE FIRST. THE NEW SOURCE OF ENERGY CHAPTER THE SECOND. THE LAST WAR CHAPTER THE THIRD. THE ENDING OF WAR CHAPTER THE FOURTH. THE NEW PHASE CHAPTER THE FIFTH. THE LAST DAYS OF MARCUS KARENIN PREFACE _The World Set Free_ was written in 1913 and published early in 1914, and it is the latest of a series of three fantasias of possibility, stories which all turn on the possible developments in the future of some contemporary force or group of forces. _The World Set Free_ was written under the immediate shadow of the Great War. Every intelligent person in the world felt that disaster was impending and knew no way of averting it, but few of us realised in the earlier half of 1914 how near the crash was to us. The reader will be amused to find that here it is put off until the year 1956. He may naturally want to know the reason for what will seem now a quite extraordinary delay. As a prophet, the author must confess he has always been inclined to be rather a slow prophet. The war aeroplane in the world of reality, for example, beat the forecast in _Anticipations_ by about twenty years or so. I suppose a desire not to shock the sceptical reader’s sense of use and wont and perhaps a less creditable disposition to hedge, have something to do with this dating forward of one’s main events, but in the particular case of _The World Set Free_ there was, I think, another motive in holding the Great War back, and that was to allow the chemist to get well forward with his discovery of the release of atomic energy. 1956—or for that matter 2056—may be none too late for that crowning revolution in human potentialities. And apart from this procrastination of over forty years, the guess at the opening phase of the war was fairly lucky; the forecast of an alliance of the Central Empires, the opening campaign through the Netherlands, and the despatch of the British Expeditionary Force were all justified before the book had been published six months. And the opening section of Chapter the Second remains now, after the reality has happened, a fairly adequate diagnosis of the essentials of the matter. One happy hit (in Chapter the Second, Section 2), on which the writer may congratulate himself, is the forecast that under modern conditions it would be quite impossible for any great general to emerge to supremacy and concentrate the enthusiasm of the armies of either side. There could be no Alexanders or Napoleons. And we soon heard the scientific corps muttering, ‘These old fools,’ exactly as it is here foretold.