He further goes into the question of the population of devils in different countries.

On the top of the Pilatus at Luzern, he says, is a black pond, which is one of the devil's favourite abodes.
In Luther's own country there is also a high mountain, the Poltersberg, with a similar pond.

When a stone is thrown into this pond, a great tempest arises, which often devastates the whole neighbourhood.

He also alleges Prussia to be full of evil spirits (!!).
Devilish changelings, Luther said, were often placed by Satan in the cradles of human children.

"Some maids he often plunges into the water, and keeps them with him until they have borne a child." These children are placed in the beds of mortals, and the true children are taken out and hurried away.