The exorcism by knife appears to be a Welsh notion; though there is an old superstition of wide prevalence in Europe that to give to or receive from a friend a knife or a pair of scissors cuts friendship. I have even encountered this superstition in America; once an editorial friend at Indianapolis gave me a very handsome pocket-knife, which he refused to part with except at the price of one cent, lawful coin of the realm, asserting that we should become enemies without this precaution. In China, too, special charms are associated with knives, and a knife which has slain a fellow-being is an invaluable possession. In Wales, according to Jones, the Gwyllion often came into the houses of the people at Aberystruth, especially in stormy weather, and the inmates made them welcome--not through any love they bore them, but through fear of the hurts the Gwyllion might inflict if offended--by providing clean water for them, and taking especial care that no knife, or other cutting tool, should be in the corner near the fire, where the fairies would go to sit. 'For want of which care many were hurt by them.' While it was desirable to exorcise them when in the open air, it was not deemed prudent to display an inhospitable spirit towards any member of the fairy world. The cases of successful exorcism by knife are many, and nothing in the realm of faerie is better authenticated. There was Evan Thomas, who, travelling by night over Bedwellty Mountain, towards the valley of Ebwy Fawr, where his house and estate were, saw the Gwyllion on each side of him, some of them dancing around him in fantastic fashion. He also heard the sound of a bugle-horn winding in the air, and there seemed to be invisible hunters riding by. He then began to be afraid, but recollected his having heard that any person seeing Gwyllion may drive them away by drawing out a knife. So he drew out his knife, and the fairies vanished directly. Now Evan Thomas was 'an old gentleman of such strict veracity that he' on one occasion 'did confess a truth against himself,' when he was 'like to suffer loss' thereby, and notwithstanding he 'was persuaded by some not to do it, yet he would persist in telling the truth, to his own hurt.'