The particulars of the seizure of the vessel were given in a letter from the commander of the English cruiser Dolphin, directed to the British commander of the division, as follows: “I have the honor to inform you, that at daylight on the 7th instant, being about seventy miles off the land, a sail was observed on the lee bow, whilst Her Majesty’s brigantine, under my command, was steering to the eastward. I made all possible sail in chase: the chase was observed making more sail and keeping away. Owing to light winds, I was unable to overtake her before 0h. 30m. A. M. When close to her and no sail shortened, I directed a signal gun to be fired abeam, and hailed the chase to shorten sail and heave to. Chase asserted he could not, and requested leave to pass to leeward; saying, if we wanted to board him, we had better make haste about it, and that ‘we might fire and be damned.’ “I directed another gun to be fired across her bows, when she immediately shortened sail and hove to: it being night, no colors were observed flying on board the chase, nor was I aware of her character. “I was proceeding myself to board her, when she bore up again, with the apparent intention of escaping. I was therefore again compelled to hoist the boat up and to close her under sail. I reached the chase on the second attempt, and found her to be the American brigantine Louisa Beaton. The master produced an American register, with a transfer of masters: this gave rise to a doubt of the authenticity of the paper, and on requesting further information, the master refused to give me any, and declined showing me his port clearance, crew list, or log-book. “The lieutenant who accompanied me identified the mate as having been in charge of the slave-brig Lucy Ann, captured by Her Majesty’s steam-sloop Rattler. Under these suspicious circumstances, I considered it my duty, as the Louisa Beaton was bound to Ambriz, to place an officer and crew on board of her, so as to confer with an American officer, or yourself, before allowing her, if a legal trader, to proceed on her voyage.” The British commander of the division, in his letter, stated, that immediately on the arrival of the vessels, he proceeded with the commander of the Dolphin and the lieutenant of the Rattler to the brigantine Louisa Beaton. Her master then presented the register, and also the transfer of masters made in Rio, in consequence of the death of the former master, but refused to show any other documents. On examining the register, and having met the vessel before on that coast, he decided that the Louisa Beaton’s nationality was perfect; but that the conduct pursued by her master, in withholding documents that should have been produced on boarding, had led to the unfortunate detention of the vessel.