HARWICH.—At 6 P.M. on the 25th April, it was reported that a schooner was ashore on the Cork Sand. The Life-boat Springwell was immediately launched, and arrived at the Sand at about 8 P.M. The stranded vessel proved to be the Henrietta, of London, bonnd from that port to Newcastle with a cargo of gunpowder and burnt ore. As she was not leaking, her crew did not wish to leave her, and the Lifeboat therefore remained near her during the night. Ultimately the schooner showed signal lights, as she was rapidly filling with water, and the Life-boat therefore went alongside her as soon as there was sufficient water on the Sand to permit her to do so, took off the crew, consisting of four men, and landed them at Harwich at about 6.30 on the following morning..