`It is the nearest thing to a systematic philosophy written by one who does not believe in systems of philosophy. Its scope is encyclopedic ... a joy to read.' - Sydney Hook, New York Times

`His intelligibility comes of stating things directly as he himself sees them, sharply defined and readily crystallised in the best English philosophical style.' - TLS

`Of peculiar importance in that it is an exemplar, for the general reader, of Russell's special contribution to human knowledge. In it he applies with his usual lucidity and wit, the methods of inquiry, which he has done so much to develop, to the question of how we come to know whatever we do know about the universe.' - The Observer