Quote from : American Fantastic Tales: Terror and the Uncanny from the 1940's Until Now Book

Cynthia had been on friendly terms with an eccentric librarian called Porlock who in the last years of his dusty life had been engaged in examining old books for miraculous misprints such as the substitution of "1" for the second "h" in the word "hither." Contrary to Cynthia, he cared nothing for the thrill of obscure predictions; all he sought was the freak itself, the chance that mimics choice, the flaw that looks like a flower; and Cynthia, a much more perverse amateur of misshapen or illicitly connected words, puns, logogriphs, and so on, had helped the poor crank to pursue a quest that in the light of the example she cited struck me as statistically insane. ("The Vane Sisters")