Scarcely was the helm put up, and a large square-sail of light canvas the little schooner carried hoisted, when the stranger seemed to observe our presence.  We had not run on for ten minutes when her head came slowly round towards us, her square-topsails were hoisted up, her foresail was rigged out, a square-sail was set, and after us she came like a greyhound in chase of a hare.