Also known as Nis (Scandanavia), Para (Finland). Kobold
Brownies, as they are called in Scotland, are tiny, good-natured, but
often mischeivous creatures. They are invisible to unbelieving adults,
but innocent children can see them. Most country houses have one resident
Brownie. When he encounters a new house, he will make a big mess in
it. The next day, if the mess has been cleaned up, he will move in with
the family, because he approves of their tidiness. Then, when the
family sleeps, he will do household chores for them, such as sweeping,
cleaning the cinders out of the fireplace, and filling the water
buckets. As long as he is treated well and his favors aren't abused, he
will remain very loyal to the family, even moving with them to new
houses. But beware the servant who mistreats a Brownie!
Kneightley, Thomas. The World Guide to Gnomes, Fairies, Elves, and
Other Little People. New York: Avenel Books, 1978.