Few writers have devoted so much energy to reminiscence as Siegfried Sassoon. In addition to the three semi-autobiographical memoirs of George Sherston, he produced three more volumes of straight autobiography. Now Sir Rupert Hart-Davis has added these diaries to the pile. Unlike the Sherston books, they do not stand on their own as works of literature. Yet the man reveals himself here as he has never done before, and it cannot be said that the viciously honest self-portrait is altogether attractive.