In the kingdom of Magadha there once lived seven brothers who were magicians. At the distance of a mile from their abode lived two brothers, sons of a Khan. The elder of these went to the seven magicians, saying, "Teach me to understand your art," and abode with them seven years. But though they were always setting him to learn difficult tasks, yet they never taught him the true key to their mystic knowledge. His brother, however, coming to visit...