This is the third and final volume of one of the most significant biographies of our times-one which, in its totality spans almost a century of social and intellectual change.  Bertrand Russell's preface follows:  "  This book is to be published while the great issues that now divide the world remain undecided.  As yet, and for some time to come, the world must be one of doubt.  It must as yet be suspended equally between hope and fear.  It is likely that I shall die before the issue is decided.   I have done what I could to add my small weight in an attempt to tip the balance on the side of hope, but is has been a puny effort against vast forces.  May others succeed where my generation failed. "   These words were written in 1969 and it is abundantly clear that 52 years have not made much progress toward making the world a better place.