On the 5th of August, the British commissioner brought off intelligence that the American commodore was signalled off the harbor. The British commodore was at this date, also, to have rendezvoused at Loanda, that the subject-matter of correspondence between the officers of the two services, might be laid before their respective commanders-in-chief. On the arrival of the American commodore, the Perry was reported, in a communication dated August the 5th, inclosing letters and papers, giving detailed information of occurrences since leaving Prince’s Island, under orders of the 6th of May; also sundry documents from the commander of the British southern division, in relation to the capture of the slave-equipped brigantine Volusia; adding, that this case being similar to a number already the subjects of correspondence, he had requested further information, which the British commander of the division would probably communicate in a few days. The letter to the commodore also stated, that our commercial intercourse with the provincial government of Portugal, and the natives of the coast, had been uninterrupted. The question arising in regard to the treaty with Portugal, whether a vessel by touching and discharging part of the cargo at a native port, is still exempt from payment of one-third of the duties on the remaining portion of the cargo, as guaranteed by treaty, when coming direct from the United States, had been submitted to our government. On the 15th of August the Cyclops arrived at Loanda, with the commander of the British southern division on board, who, in a letter dated the 12th of August, stated, that agreeably to the promise made on the 23rd ultimo, of furnishing the details from the commander who had captured the Volusia, he now furnished the particulars of that capture, which he trusted would prove satisfactory. He also gave information that the British commander-in-chief was then on the south coast, to whom all further reference must be made for additional information, in case it should be required. The reply from the officer who had captured the Volusia stated, that he had boarded her on the 2nd of July off the Congo River. She had the American ensign flying, and on the production of documents, purporting to be her papers, he at once discovered the register to be false: it was written on foolscap paper, with the original signature erased; her other papers were likewise forgeries. He therefore immediately detained her. They had been presented to him by the ostensible master, apparently an American, but calling himself a Brazilian, and claiming the protection of that empire. The register and muster-roll were destroyed by the master; the remainder of the records were sent in her to St. Helena, for adjudication. The British commander further stated, that on discovering the Volusia’s papers to be false, her master immediately hauled down the ensign, and called from below the remainder of the crew, twelve in number, all Brazilians.