Prop. 5, book i. of Euclid. This is the first difficult proposition in geometry, and stupid boys rarely get over it the first time without tripping.
It is the ass’s pitfall, not his bridge.
If this be rightly called the “Bridge of Asses,”
He’s not the fool who sticks, but he that passes.
E. C. B.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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