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This edition contains new material, but it is shorter (though not meant to be attempted at one sitting) than its predecessor and, I sincerely hope, much clearer. One other criticism of the first edition I fully deserved. There was an irritating swarm of new-coined words. These I have almost completely abolished. [from the Author's Preface to the second edition of 1968, as reproduced in the New American Library edition of 1970].