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"Aristotle could haye avoided the mistakes of thinking that women have fewer teeth than
men, by the simple device of asking Mrs Aristotle to keep her mouth open while he
counted. He did not do so because he thought he knew. ⑤ Thinking that you know when
in fact you dont is a fatal mjstake, to which we are all prone. T believe myself that
"hedgehogs eat black-beetles, because I have been told that they do : but 下1 were writing
a book on the habits of hedgehogs. I should not commit myself until 1 had seen one
enjoying this unappetising diet. Aristotle. however, was less cautious. Ancient and
medieval authors knew all about unicorns and *salamanders : not one of them thought it