The waters around Fortress Monroe were thronged with a gallant array of ships of war and transports, wearing the Union flag,--"Old Glory," as I hear it called in these days. A little withdrawn from our national fleet lay two French frigates, and, in another direction, an English sloop, under that banner which always makes itself visible, like a red portent in the air, wherever there is strife. In pursuance of our official duty, (which had no ascertainable limits,) we went on board the flag-ship, and were shown over every part of her, and down into her depths, inspecting her gallant crew, her powerful armament, her mighty engines, and her furnaces, where the fires are always kept burning, as well at midnight as at noon, so that it would require only five minutes to put the vessel under full steam. This vigilance has been felt necessary ever since the Merrimack made that terrible dash from Norfolk. Splendid as she is, however, and provided with all but the very latest improvements in naval armament, the Minnesota belongs to a class of vessels that will be built no more, nor ever fight another battle,--being as much a thing of the past as any of the ships of Queen Elizabeth's time, which grappled with the galleons of the Spanish Armada. On her quarter-deck, an elderly flag-officer was pacing to and fro, with a self-conscious dignity to which a touch of the gout or rheumatism perhaps contributed a little additional stiffness. He seemed to be a gallant gentleman, but of the old, slow, and pompous school of naval worthies, who have grown up amid rules, forms, and etiquette which were adopted full-blown from the British navy into ours, and are somewhat too cumbrous for the quick spirit of to-day. This order of nautical heroes will probably go down, along with the ships in which they fought valorously and strutted most intolerably. How can an admiral condescend to go to sea in an iron pot? What space and elbow-room can be found for quarter-deck dignity in the cramped lookout of the Monitor, or even in the twenty-feet diameter of her cheese-box? All the pomp and splendor of naval warfare are gone by. Henceforth there must come up a race of enginemen and smoke-blackened cannoneers, who will hammer away at their enemies under the direction of a single pair of eyes; and even heroism--so deadly a gripe is Science laying on our noble possibilities--will become a quality of very minor importance, when its possessor cannot break through the iron crust of his own armament and give the world a glimpse of it.