The only information the admiral was able to gain on the subject was, that the attack had been made by a party of slave-dealers, who hoped to surprise the brigantine, cut the throats of the prize-crew, and then make sail to another port, and land the slaves, trusting of course to the effects of bribery to escape detection. CHAPTER TWENTY ONE. RIO--EXPEDITION UP THE HARBOUR--YARNS SPUN--HIGSON AND THE MIDSHIPMEN CAPTURED BY SLAVE-DEALERS--IMPRISONED--TRIED--A FRIEND IN NEED--SENT BACK TO PRISON--ESCAPE--PURSUED--JACK AS USUAL APPEARS--AGAIN AT SEA-- CHASE A SLAVER--RUN OVER HER AT NIGHT. Every one knows that Rio de Janeiro is one of the most magnificent harbours in the world, with its Organ mountains in the distance, its surrounding heights covered with the richest foliage, its curiously-shaped rocks at the entrance, and its stately city scattered along its shores. On entering, Jack and Terence, much to their satisfaction, found not only the corvette but the frigate also at anchor. Having gone on board the admiral's ship to report their arrival and the occurrence which had taken place at Bahia, they paid a visit to Murray. Of course, Terence gained great credit for having beaten off the pirates. He was glad to find that he was to be relieved of the charge of the slaver, which he had been afraid he might have to carry over to Sierra Leone. In the harbour lay a considerable squadron of steamers and sailing-vessels, for which a variety of work had been cut out. The Brazilian Government had at last united with the English in the determination of putting a stop to the importation of slaves into the country, though they acknowledged that their own men-of-war could do little or nothing; the fact being that the Brazilian officers were more or less interested in supporting the abominable traffic. Two or three other ships were in the harbour, taking in water and provisions before going for a long cruise in the Pacific, and an expedition was also to be sent to the Parana against General Rosas, who, setting all treaties at defiance, had stopped up the navigation of the river. As neither the corvette nor brig were likely to sail for some days, the officers made excursions on shore. Tom and Desmond were delighted to find that Archy Gordon had so greatly recovered that he was able to go to sea in the frigate--he was now nearly as well as ever, but still was not allowed to take exercise on shore. They proposed making a trip up the harbour, and Higson got permission to take the corvette's pinnace. "You must take care of the youngsters better than you did once upon a time," said Adair. "Don't expend any of them if you can help it." "No fear," answered Higson, "I will watch over them as carefully as a hen does her chickens, or a nurserymaid the half-dozen small children committed to her care."