But Jack, Hal and Eph could be happy nowhere except under their own Flag. They are now accepted most cordially by all their brother officers, young and old, in the United States Navy. For the most part, so far, the duties of our young officers have been aboard the different boats purchased from the Pollard Company. Yet, for the sake of practice and change, they have been, at times, detailed aboard other classes of craft in the Navy. We shall now encounter our young acting naval officers in one of their new fields of special work, in the next volume of this series, which is published under the title: "_The Submarine Boys And the Smugglers; Or, Breaking Up the New Jersey Customs Frauds_." Here we shall find our talented lads engaged in doing some of their finest work for Uncle Sam's Government, and under circumstances that will delight every reader.