“His greatest treasure of historic lore, however, was discovered in an old goblin-looking mill, situated among rocks and water-falls, with clanking wheels, and rushing streams, and all kinds of uncouth noises. A horse-shoe, nailed to the door to keep off witches and evil spirits, showed that this mill was subject to the awful visitations. As we approached it, an old negro thrust his head, all dabbled with flour, out of a hole above the water-wheel, and grinned, and rolled his eyes and looked like the very hobgoblin of the place. The illustrious Diedrich fixed upon him, at once, as the very one to give him that invaluable kind of information,…