The rapid development of the steam engine as a motive power, and its widely distributed application, soon attracted the attention of the lovers of nautical sports, and before the year 1860 the all-conquering engine began to be used for the propulsion of pleasure craft. The invasion of fields of sport by the engine did not then recommend, nor has it since recommended, itself to the hearts of true yachtsmen; all that is so attractive in yachting seems to vanish as soon as the element of uncertainty is eliminated: all the poetry of motion, all the sense of freedom from disagreeable surroundings, as well as all interest in winds and water--all are sunk when the sail is changed for the engine as a propelling force. The steam yacht should be considered chiefly in the light of a very agreeable mode of locomotion, and as such it is unquestionably a very desirable adjunct to our resources, filling as it does a place that would be wholly impossible for sailing craft, when the uncertain character of winds and water is considered. The first idea of steam yachting in America was realised in the famous cruise of the 'North Star,' a side-wheel steamship of 2,004-25/95 tons, built for Mr. Cornelius Vanderbilt in 1852. She was the most handsomely appointed vessel of her day, and sailed temporarily under the flag of the New York Yacht Club, which fixed her identity as a yacht, although she was built for merchant service. The 'North Star,' brigantine rig, was built by Jeremiah Simonson, of Green Point, Long Island. Length over all, 270 ft., 38 ft. beam, 28 ft. 6 in. depth, 16 ft. draught. She was fitted with two vertical beam engines, cylinders 60 in. diameter by 10 ft. stroke; two boilers, 10 ft. diameter by 24 ft. long; paddle-wheels, 34 ft. in diameter. She was broken up at Cold Spring, Long Island, in 1870. The Aspinwalls were the first promoters of real steam yachting, and as early as 1854 the 'Firefly' was launched by Smith & Dimon, of New York, for Messrs. W. H. Aspinwall and J. L. Aspinwall. Her length was 97 ft. 8 in. over all, 19 ft. beam, 5 ft. 2 in. hold, 3 ft. 9 in. draught, engines built by the Morgan Iron Works, oscillating cylinders 20 by 36 in., locomotive boiler, paddle-wheels 8 ft. 8 in. diameter, size of paddles 17 by 45 in. She was sold to the United States Government for duty on the Coast Survey Service--89-93/95 tons. 'Clarita,' built for Leonard W. Jerome by Lawrence Faulkes Williams, 1864; length over all, 125 ft.; 121 ft. 9 in. water-line, 22 ft. beam, 9 ft. depth, draught 11 ft. 6 in., 231-30/95 tons. Engine by Novelty Iron Works, 2 cylinders 22 by 22 in., diameter of screw 9 ft. 6 in. Sold to Pacific Mail Steamship Company, and is now doing towing duty on the Kennebec River, Maine.