Book excerpt: 'In this witty and entertaining excursion through previously unchartered areas of the world of Pooh, John Tyerman Williams sets out to prove beyond a doubt that the whole of Western philosophy - from the cosmologists of ancient Greece to existentialism in this century - may be found in Winnie-the-Pooh and The House at Pooh Corner. This book confirms what many have long suspected: that Pooh is a Bear of Enormous Brain