According to old superstition, the devil gave the witches of
Sweden cats, which were called carriers, because they were sent
by their mistresses to steal in the neighborhood. On such occasions,
the greedy animals could not resist satisfying their own
appetites. Sometimes they ate to repletion and were obliged to
disgorge their stolen meal. Their vomit, found in kitchen gardens,
was a yellow color, and it was called witches butter.