The Boston is a steamer of the outside line from Philadelphia to New York. She just held our legion. We tramped on board, and were allotted about the craft from the top to the bottom story. We took tents, traps, and grub on board, and steamed away down the Delaware in the sweet afternoon of April. If ever the heavens smiled fair weather on any campaign, they have done so on ours. THE "BOSTON." Soldiers on shipboard are proverbially fish out of water. We could not be called by the good old nickname of "lobsters" by the crew. Our gray jackets saved the _sobriquet_. But we floundered about the crowded vessel like boiling victims in a pot. At last we found our places, and laid ourselves about the decks to tan or bronze or burn scarlet, according to complexion. There were plenty of cheeks of lobster-hue before next evening on the Boston. A thousand young fellows turned loose on shipboard were sure to make themselves merry. Let the reader imagine that! We were like any other excursionists, except that the stacks of bright guns were always present to remind us of our errand, and regular guard-mounting and drill went on all the time. The young citizens growled or laughed at the minor hardships of the hasty outfit, and toughened rapidly to business. Sunday, the 21st, was a long and somewhat anxious day. While we were bowling along in the sweet sunshine and sweeter moonlight of the halcyon time, Uncle Sam might be dethroned by somebody in buckram, or Baltimore burnt by the boys from Lynn and Marblehead, revenging the massacre of their fellows. Every one begins to comprehend the fiery eagerness of men who live in historic times. "I wish I had control of chain-lightning for a few minutes," says O., the droll fellow of our company. "I'd make it come thick and heavy and knock spots out of Secession." At early dawn of Monday the 22d, after feeling along slowly all night, we see the harbor of Annapolis. A frigate with sails unbent lies at anchor. She flies the stars and stripes. Hurrah! A large steamboat is aground farther in. As soon as we can see anything, we catch the glitter of bayonets on board. By-and-by boats come off, and we get news that the steamer is the "Maryland," a ferry-boat of the Philadelphia and Baltimore Railroad. The Massachusetts Eighth Regiment had been just in time to seize her on the north side of the Chesapeake. They learned that she was to be carried off by the crew and leave them blockaded. So they shot their Zouaves ahead as skirmishers. The fine fellows rattled on board, and before the steamboat had time to take a turn or open a valve, she was held by Massachusetts in trust for Uncle Sam. Hurrah for the most important prize thus far in the war! It probably saved the "Constitution," "Old Ironsides," from capture by the traitors. It probably saved Annapolis, and kept Maryland open without bloodshed.