There is a story told of a miller in North Wales, Robert Francis, that at the time of the year when he was drying corn he used often to stay up late at night to attend to the fire, as a constant heat was essential. He made, therefore, frequent visits to the mill even past midnight. One night he happened to leave there are large vessel full of water, and on visiting the mill just before retiring he was surprised to see two little people there whom he took to be man and wife busily having a bath. Being a kind-hearted man and not wishing to disturb them, he went back and told his wife. ‘Oh’, she said ‘they are the fairies.’ After the lapse of some time he returned to the mill, but they were gone; they had, however, left the place perfectly clean and in good order, and in addition had left behind them a sum of money. This was not the end, they came again – and brought their friends with them – for the miller had now decided to leave that bathful of water there every night. As their number increased, so did the sum of money left behind. This went on for a long time to the mutual advantage of both parties, until one day the miller was foolish enough to tell his neighbours all about it. At once their visits and money ceased. D. Parry-Jones, Welsh Legends and Fairy Lore, 15-17