In this it was stated to the commodore, that the Perry, agreeably to his orders, had made the best of her way for Ambriz, and arrived off that place on the 5th instant. It was there reported that the John Adams was probably at Loanda; and accordingly a course was shaped for that port. But on the 6th instant, at three o’clock in the afternoon, a large ship with two tiers of painted ports was made to windward, standing in for the land towards Ambriz. At four o’clock the chase was overhauled, having the name “Martha, New York,” registered on her stern. The Perry had no colors flying. The ship, when in range of the guns, hoisted the American ensign, shortened sail, and backed her main-topsail. The first lieutenant, Mr. Rush, was sent to board her. As he was rounding her stern, the people on board observed, by the uniform of the boarding-officer, that the vessel was an American cruiser. The ship then hauled down the American, and hoisted Brazilian colors. The officer went on board, and asked for papers and other proofs of nationality. The captain denied having papers, log, or any thing else. At this time something was thrown overboard, when another boat was sent from the Perry, and picked up the writing-desk of the captain, containing sundry papers and letters, identifying the captain as an American citizen; also indicating the owner of three-fifths of the vessel to be an American merchant, resident in Rio de Janeiro. After obtaining satisfactory proof that the ship Martha was a slaver, she was seized as a prize. The captain at length admitted that the ship was fully equipped for the slave-trade. There were found on board the vessel, one hundred and seventy-six casks filled with water, containing from one hundred to one hundred and fifty gallons each; one hundred and fifty-barrels of farina for slave-food; several sacks of beans; slave-deck laid; four iron boilers for cooking slave-provisions; iron bars, with the necessary wood-work, for securing slaves to the deck; four hundred spoons for feeding them; between thirty and forty muskets, and a written agreement between the owner and captain, with the receipt of the owner for two thousand milreis. There being thirty-five persons on board this prize, many of whom were foreigners, it was deemed necessary to send a force of twenty-five men, with the first and second lieutenants, that the prize might be safely conducted to New York, for which place she took her departure that evening.