CHARLESTON, March 88—SAiptrrwfo.— Wi Itam by tho arrival of the sloop Win. II#nry, Capt. Canmok, from Key West, that on the 16th inst. tht ship BrewsUr, Capt. Thatcher, from New Orleaus for Boston, got ashore in a fog, oh Folly Rocks, opposite Capo Florida and bilged. On the 18th inst the sea making a fair breach over her, slipped .the chain', and cut away the roizren-mast and topgallant mast to prevent the vessel going entirely to nieces. Her cargo, consisting of Cotton,Pork, eM had been mostly token out, in a damaged state, and carried to Key West. On Wednesday, the -William Henry spoke the wrecking sloop Convoy, with a cargo or Cotton from the Brewster, who informed Capt. C., that there was another ship ashore on the Inside of Florida Reef then in sight, and requested him to inform any wreckers lie might fall in with of the circumstance,—Courier*