The raven and the writing desk

As all the readers of Alice's Adventures in Wonderland will know, when Alice sat down (uninvited) at the mad tea party, the Hatter opened his eyes very wide and asked, "Why is a raven like a writing desk?" The riddle is famous because when Alice in turn asked, "What's the answer?" the Hatter replied that he hadn't the faintest idea. It has provoked ingenious possible answers from many great minds, but in this utterly engaging "Enquiry," Francis Huxley has undertaken the first investigation in depth. - Jacket flap.