It was once a common custom in East Cornwall, when houses were built, to leave holes in the walls by which these little beings could enter; to stop them up would drive away good luck.
In West Cornwall knobs of lead, known as pisky's paws or pisky feet, were placed at intervals on the roofs of farm-houses to prevent the piskies from dancing on them and turning milk sour.
Country people in East Cornwall sometimes put a prayer book under a child's pillow as a charm to keep away piskies. I am told that a poor woman, near Launceton, was fully persuaded that one of her children was taken away and a pisky substituted, the disaster being caused by the absence of a prayer book on one particular night.
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