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Aristotle, which makes an octavo volume of rather less than 400 pages. I think it is a book which will be interesting and valuable to the few, but perhaps _only_ to the few. However, George's happiness in writing his books makes him less dependent than most authors on the audience they find. He felt that a thorough account of Aristotle's science was a bit of work which needed doing, and he has given his utmost pains to do it worthily. These are the two most important conditions of authorship; all the rest belong to the