In mid-ocean-the Pacific. Two ships within sight of one another, less than a league apart. Both sailing before the wind, running dead down it with full canvas spread-not side by side, but one in the wake of the other. Is it a chase? To all appearance, yes; a probability strengthened by the relative size and character of the vessels. One is a barque, polacca-masted, her masts raking back with the acute shark's-fin set supposed to be characteristic of piratical craft. The other is a ship, square-rigged and full sized; a row of real, not painted, ports, with a gun grinning out of each, proclaiming her a man-of-war.