After remaining a week in Loanda, making proper repairs on the vessel, and refreshing the crew, the Perry ran down the coast to the northward, for the purpose of cruising off Ambriz, a noted slave-station, under native authority, with several factories for legal trade. Arriving at this station the following morning, three English steam cruisers were in sight. The second lieutenant of the Perry was sent to call on the commanding officer of the southern division of the British squadron, who soon afterwards called on board the American cruiser in person. In a letter, dated the 24th of March, the British commanding officer informed the commander of the Perry, that it afforded him great pleasure to witness the presence of a United States vessel on the southwest coast of Africa, to be employed in co-operation with British vessels in the suppression of the slave-trade. And he therefore took the liberty to transmit, by the officer of the Perry, kindly sent to wait upon him, two documents connected with Brazilian slave-vessels, which had lately come over to that coast, displaying the American ensign, and presenting to the English boarding-officer (as they had proven) fraudulent American papers. He assured him, that in the necessary examination of these papers, every respect had been paid to the American flag, and the visit made in strict accordance with the treaty between the United States of America and Great Britain; and that it was not until the different vessels had voluntarily hauled down their ensigns and destroyed their papers, stating at the same time that they were Brazilians, that possession was taken of them. He intimated that a letter--a copy of which was inclosed--had been addressed to him by a lieutenant of the “Cyclops,” who had conducted to the Island of St. Helena one of the prizes, on board of which were two American seamen, and that this letter would give some idea of the plan pursued by parties in Brazil, to equip and man Brazilian slave-vessels.