It soon became evident that a keen watch upon our movements was being maintained by the pirates; for no sooner had it been made apparent that we intended to close with the strangers than all attempts at further concealment were abandoned, the ship's courses were clewed up, her yards were squared; to facilitate the hoisting out of cargo, additional tackles were got aloft, and all the signs of greatly increased activity on board her at once became manifest.  It now also became apparent that some means had been resorted to for the purpose of keeping her broadside presented to us and her hull interposed between us and the pirate vessel, and that these means had now been abandoned as of no further avail; for within the next ten minutes she swung stem-on to us, and we saw that there was indeed another craft alongside her--a slashing big topsail schooner, immensely beamy, with all her canvas clewed up and furled, and her decks cumbered with bales and packages of all sizes and descriptions, which were being hoisted out of the big ship's hold and lowered over the side with feverish activity.  As the two craft swung round, revealing the presence of the second vessel, our lads gave a cheer of delight and exultation, and applied themselves with such fierce energy to the toil of working the heavy sweeps that they churned the glassy surface of the ocean into a long double row of miniature whirlpools, that went swirling and frothing away from the blades of the sweeps into the wake of the schooner, to the distance of a full quarter of a mile.