We had only just barely completed our preparations when the strange brig, under topsails and fore-topmast staysail, came sweeping round the eastern extremity of the island, bracing sharp up as she did so and making a short "leg" athwart the anchorage, toward the mainland.  Then, tacking very smartly, even under such short canvas as she was showing, she headed well up for the line of buoys which had been laid down as moorings, and, splendidly handled, presently came up head to wind, settling away both topsail-yards to the caps as she did so, and, while her crew clewed up the topsails and hauled down the staysail, glided, with the way which she still had on her, up to the weathermost buoy, to which a hawser was promptly run out and made fast.  Then, as about a dozen hands climbed into the fore and main rigging and made their leisurely way aloft for the purpose of rolling up the topsails, a light, handsome gig was dropped into the water from the starboard quarter davits and presumably hauled alongside the gangway; but this I could not see, as she was presenting her port broadside to us--which, by the way, I noticed, was garnished with five grinning twelve-pounders.  She was a most beautiful vessel, lying long and low upon the water, her hull painted all black, from her rail to her copper, relieved only by a single narrow white stripe running along her sheer-strake from her white figure-head to the rather elaborate white scroll-work that decorated her quarter.  She was grandly sparred, with very heavy lower-masts, long mastheads, painted white, very taunt topmasts, topgallant and royal- masts, stayed to a hair, with a slight rake aft, and accurately parallel, and enormously long yards.  The French ensign floated lazily from the end of her standing gaff.