"_Piracies._--The last news that has been received from this squadron is contained in the New-York papers extracted from the _St. Thomas' Times_ of March 5. On the 4th the squadron got under weigh and put to sea from St. Thomas'. Piracies of an enormity that the bare recital of them make the blood run cold, are continually taking place. A Dutch Brig was taken in sight of Moro Castle, at Havanna. The French Brig La Jeune Henrietta was taken on the 17th of March, the captain, passengers, and all the crew were most cruelly beaten, and they and the vessel robbed. The Schooner Success, from Matanzas, bound to New Providence, was captured and converted into an assistant pirate, two ladies, passengers, made prisoners, one of whom was hanged up till life was almost extinct, in order to make her confess where the money on board was secreted. The Dutch Brig Minerva was captured and burned. The Brig Columbia, from Washington, North Carolina, was captured, robbed of parts of her cargo and sails. The Brig Alert, from New Orleans, was boarded off the Moro by three boats, the captain and cook killed, and one man mortally wounded. A brig has lately arrived from the Balize, belonging to Kennebunk, formerly commanded by Captain Perkins, she was from Port-au-Prince, via Campeachy, where he was boarded by a pirate schooner of about forty tons, manned by forty ruffians. 'They stabbed Captain Perkins in a cruel manner and cut off one of his arms; he then told them where the money was, which amounted to two hundred doubloons; after which they cut off his other arm and thigh, placed oakum dipped in oil under his body and in his mouth, and set fire to it, which soon put an end to his life. The mate had a sword thrust through his thigh, and the vessel was robbed of everything moveable, such as cables, anchors, charts, books, rigging, sails, &c.' It would seem by these accounts, which have all come to hand the past week, that our squadron was of little or no use in those seas. The true way we think would be to put armed crews on board of merchantmen, at sea, after they had left the port they sailed from, and in this way the pirates could get no intelligence of vessels destined to go against them.