It will be remembered that when the Union forces, alarmed by the threatening attitude of the inhabitants of Norfolk and the vicinity, fled from the Norfolk navy-yard, leaving every thing there in flames, they left behind them a fine United States frigate, "Merrimac," a ship of thirty-five hundred tons, carrying forty guns. The departing Federals did their work of destruction fairly well; for the great ship was burnt to the upper edge of her copper sheathing, and sank to the bottom of the river. Three or four months after the occupation of the Norfolk navy-yard by the Confederates, Lieut. George M. Brooke, an ex-officer of the United States navy, who had resigned that he might follow the fortunes of his State, while looking at the hulk lying in the river-channel, was suddenly inspired with the thought that she might be raised and converted into a formidable vessel-of-war. He carefully matured his plans, and after due consideration proposed to the Confederate secretary of the navy, that the "Merrimac" be raised and converted into an iron-clad. His plans were approved, and orders were given that they should be carried out. The "Merrimac," as originally built, was one of the grand old types of war-vessels. Her solid oak sides rose high above the water, and were pierced by a long row of gaping portholes. Her masts towered high in the air; and when her great sails were set, her hull seemed crushed beneath so vast an expanse of canvas. When she had been remodelled, her entire appearance was changed. She had no longer the appearance of a ship, but seemed like a house afloat; and tradition says that the old salt on the "Cumberland," who first sighted her, reported gravely to the officer of the deck, "Quaker meetin'-house floating down the bay, sir."