This comes from Evans-Wentz’ work in western Cornwall c. 1909.

A man named Bottrell, who lived near St. Teath, was pisky-led at West Down, and when he turned his pockets inside out he heard the piskies going away laughing. Often my grandmother used to say when I got home after dark, ‘You had better mind, or the piskies will carry you away.’ And I can remember hearing the old people say that the piskies are the spirits of dead-born children.’ From pixies the conversation drifted to the spirit-hounds ‘often heard at night near certain haunted downs in St. Teath parish’, and then, finally, to ordinary Cornish legends about the dead.