A gentleman of Ypsilanti, Mich., has invented one that he claims to have ridden from that place to Detroit, a distance of twenty-eight miles, in two hours and forty-eight minutes; and to have made a mile in Ypsilanti in two minutes and thirty seconds. The wheels of this machine are forty-two inches in diameter, and are propelled by means of a double hand crank, no treadles being used. On each side of the hub of the forward wheel, is a grooved pulley; and attached to the straight portion of the crank are two more pulleys, the four being connected by belts. At each revolution of the pulleys, the vehicle is propelled a distance of sixteen and a half feet; and when an ordinary rate of speed is attained, it runs quite easily. Its weight is forty-nine pounds, and the inventor claims that it will sustain two hundred pounds without danger of collapsing. It can be run on ordinary carriage roads, with comparative ease. Samuel Marden of Newton Corner, Mass., has lately commenced the manufacture of a three-wheeled velocipede for which he obtained a patent in February, 1868. He calls his machine “a mechanical horse;” it is propelled _by the weight of the rider_, and by friction. It has neither treadles, cranks, or guiding arms. The rider rises in his stirrups as on a trotting horse. The saddle is so arranged that the pressure upon it revolves a gearing wheel, which acts upon a small one connected with the axle of the rear wheel; these wheels are thus made to turn very rapidly. It will be seen that this velocipede is constructed upon an entirely new principle. It is claimed that it can be driven upon the road, at the rate of from ten to fifteen miles an hour. This machine can be used by ladies, with a side-saddle arrangement. Its price is $125. Mr. Marden’s velocipede has been tested, and we think he has a fortune in his invention. He has more orders than he can fill, and is prepared to sell State, county, and town rights. HEMMING’S UNICYCLE, OR “FLYING YANKEE VELOCIPEDE.” The single-wheeled velocipede has at length received a palpable body, and “a local habitation and a name.” [Illustration]