Grimms' fairy tales

A certain miller had little by little fallen into poverty, and had nothing left but his mill and a large apple-tree behind it. Once when he had gone into the forest to fetch wood, an old man stepped up to him whom he had never seen before, and said, Why dost thou plague thyself with cutting wood, I will make thee rich, if thou wilt promise me what is standing behind thy mill? What can that be but my apple-tree? thought the miller, and said, Yes, and gave a written promise to ...