Legends From River and Mountain by Carmen Sylva

There was once a young fellow who dwelt near the Brocken, and he had / won a lovely maiden for his bride. He thought himself a lucky man, but / then he did not know that both the girl and her mother were witches. / Now one evening he tarried very late at his bride's house, and could / not guess why she and her mother were so eager to send him away, for / generally the maiden was loth to let him go; and he did not know that / this was Walpurgis-night, the great meeting-time of the witches. Yet / he grew suspicious, and after he had bidden his dear "good-night," he / hid himself in the hay-loft, for he half expected to see another man / creep up for a stolen meeting with his sweetheart, and was ready to fly / at his throat. But, instead of this, he beheld mother and daughter step / into the hay-loft alone, and the mother held in her hand a strangely / shaped glass. There they stood in the middle of the barn, and spoke / strange words, and drank from the glass, when lo! on a sudden they had / disappeared.

Now this tore the bridegroom's heart with dread and foreboding, and / he determined to follow them. So he came from his hiding-place, and / took up the glass they had left behind. A few drops of red, fiery / liquid still remained in it. Then the lad went out and plucked a / garland of dragon-wort, which he wound round about him, to preserve / him from witchcraft; and after he had done this, he boldly drank all / that remained in the glass, repeating the same words that he had heard / his sweetheart use. And behold! in the twinkling of an eye, he found / himself on the Brocken, in the midst of the magic circle among the / rocks, where the witches meet.