The mediæval devil was, for the most part, himself little more than a prankish Rübezahl, or Robin Goodfellow; the new Satan of the Reformers was, in very deed, an arch-fiend, the enemy of the human race, with whom no truce or parley might be held. The old folklore belief in _incubi_ and _succubi_ as the parents of changelings is brought into connection with the theory of direct diabolic begettal. Thus Luther relates how Friedrich, the Elector of Saxony, told him of a noble family that had sprung from a _succubus_: "Just," says he, "as the Melusina at Luxembourg was also such a _succubus_, or devil". In the case referred to, the _succubus_ assumed the shape of the man's dead wife, and lived with him and bore him children, until, one day, he swore at her, when she vanished, leaving only her clothes behind. After giving it as his opinion that all such beings and their offspring are wiles of the devil, he proceeds: "It is truly a grievous thing that the devil can so plague men that he begetteth children in their likeness. It is even so with the nixies in the water, that lure a man therein, in the shape of wife or maid, with whom he doth dally and begetteth offspring of them." The change whereby the beings of the old naive folklore are transformed into the devil or his agents is significant of that darker side of the new theology, which was destined to issue in those horrors of the witchcraft-mania that reached their height at the beginning of the following century. One more story of a "changeling" before we leave the subject. Luther gives us the following as having come to his knowledge near Halberstadt, in Saxony. A peasant had a baby, who sucked out its mother and five nurses, besides eating a great deal. Concluding that it was a changeling, the peasant sought the advice of his neighbours, who suggested that he should take it on a pilgrimage to a neighbouring shrine of the Mother of God. While he was crossing a brook on the way, an impish voice from under the water called out to the infant, whom he was carrying in a basket. The brat answered from within the basket, "Ho, ho!" and the peasant was unspeakably shocked. When the voice from the water proceeded to ask the child what it was after, and received the answer from the hitherto inarticulate babe that it was going to be laid on the shrine of the Mother of God, to the end that it might prosper, the peasant could stand it no longer, and flung basket and baby into the brook. The changeling and the little devil played for a few moments with each other, rolling over and over, and crying "Ho, ho, ho!" and then they disappeared together. Luther says that these devilish brats may be generally known by their eating and drinking too much, and especially by their exhausting their mother's milk, but they may not develop any certain signs of their true parentage until eighteen or nineteen years old. The Princess of Anhalt had a child which Luther imagined to be a changeling, and he therefore advised its