Once upon a time there was a miller, who lived in Anglesey. One day
he noticed that some of his sacks had been moved during the night.
The following day he felt sure that some of his grain had been
disturbed, and, lastly, he was sure someone had been working his
mill in the night during his absence. He confided his suspicions to
a friend, and they determined to go the next night and watch the
mill. The following night, at about midnight, as they approached the
mill, that stood on a bare stony hill, they were surprised to find
the mill all lit up and at work, the great sails turning in the
black night. Creeping up softly to a small window, the miller looked
in, and saw a crowd of little men carrying small bags, and emptying
them into the millstones. He could not see, however, what was in the
bags, so he crept to another window, when he saw golden coins coming
from the mill, from the place where the flour usually ran out.

Immediately the miller went to the mill door, and, putting his key
into the lock, he unlocked the door; and as he did so the lights
went out suddenly, and the mill stopped working. As he and his
friend went into the dark mill they could hear sounds of people
running about, but by the time they lit up the mill again there was
nobody to be seen, but scattered all about the millstones and on the
floor were cockle-shells.

After that, many persons who passed the mill at midnight said they
saw the mill lit up and working; but the old miller left the fairies
alone to coin their money.