Rub the wart with a cotton rag, spit on the rag and hide it under a water-board (a wooden gutter used as a duct for rain-water off the roof of a house), where the water will drip on it. The whole operation must be kept secret.
Kansas.
Superstition #918
Source: Current Superstitions (1896), entry 918.
Fanny D. Bergen, editor.
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