The United States frigate "San Jacinto," which was one of the many vessels kept rushing about the high seas in search of the privateer "Sumter," happened to be in the harbor of Havana at this time. She was commanded by Capt. Wilkes, an officer who had made an exhaustive study of international law, particularly as bearing upon the right of a war-vessel to search a vessel belonging to a neutral nation. Capt. Wilkes, knowing that by capturing the Confederate commissioners, he could win for himself the applause of the entire North, determined to make the attempt. By a study of his books bearing on international law, he managed to convince himself that he was justified in stopping the British steamer, and taking from it by force the bodies of Messrs. Mason and Slidell. Accordingly he set sail from the harbor of Havana, and cruised up and down at a distance of more than a marine league from the coast, awaiting the appearance of the vessel. Five days after the "San Jacinto's" departure, the commissioners set sail in the British mail-steamer "Trent." She was intercepted in the Bahama Channel by the "San Jacinto." When the man-of-war fired a blank cartridge as a signal to heave to, the commander of the "Trent" ran the British flag to the peak, and continued, feeling secure under the emblem of neutrality. Then came a more peremptory summons in the shape of a solid shot across the bows; and, as the incredulous captain of the "Trent" still continued his course, a six-inch shell was dropped within about one hundred feet of his vessel. Then he stopped. A boat put off from the "San Jacinto," and made for the "Trent." Up the side of the merchant-vessel clambered a spruce lieutenant, and demanded the immediate surrender of the two commissioners. The captain protested, pointed to the flag with the cross of St. George waving above his head, and invoked the power of her Britannic majesty,--all to no avail. The two commissioners had retired to their cabins, and refused to come out without being compelled by actual force. The boat was sent back to the "San Jacinto," and soon returned with a file of marines, who were drawn up with their muskets on the deck of the "Trent." Every British ship which carries mails carries a regularly commissioned officer of the navy, who is responsible for them. This officer on the "Trent" was somewhat of a martinet, and his protests at this violation of the rights of a neutral vessel were very vigorous. When the first gun was fired, he rushed below, and soon re-appeared in all the resplendent glory of gold lace and brass buttons which go to make up a naval uniform. He danced about the deck in an ecstasy of rage, and made the most fearful threats of the wrath of the British people. The passengers too became excited, and protested loudly. Every thing possible was done by the people of the "Trent" to put themselves on record as formally protesting. Nevertheless, the commissioners were