Cipher

Dr. Whewell’s riddle is—

“A headless man had a letter (o) to write,

He who read it (naught) had lost his sight;

The dumb repeated it (naught) word for word,

And deaf was the man who listened and heard (naught).

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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.