At seven o'clock the next morning all our doubts were set at rest by the appearance of two craft--a slashing brig and a very smart-looking little schooner--coming out over the bar with the _Shark's_ boats in tow; and ten minutes later they rounded-to and anchored close to us.  We now had an opportunity to take a good look at our prizes, and it needed no second glance to assure us that both were perfectly superb examples of the shipbuilder's art.  Long, low, and extraordinarily beamy, they carried spars big enough for craft of twice their tonnage, upon which they spread an area of canvas that made some of us stare in amazement, and which, combined with their exquisitely perfect lines, gave them a speed that enabled them to defy pursuit.  The _Dona Inez_, as the brig was named, was a craft of three hundred and eighty-six tons register, and drew only ten feet of water aft; while the _Francesca_--the schooner,--on a tonnage of one hundred and twenty, drew only six feet. That they had been built for the express purpose of slave traffic was apparent at the first glance; and they were, moreover, completely fitted for that traffic, for they had slave-decks, and had manacles, meal, and water on board, but no slaves.