Before purchasing any machine, especially the cheaper ones, examine them thoroughly; or if not a judge of good mechanical workmanship, ask a friend to do it for you. Many defects are concealed by the coatings of paint, particularly in the castings and forgings; and a machine that is weak in any point, is a dangerous one in fast riding. Be sure that every bolt is properly secured by nuts that cannot be shaken off; they should be riveted into the bolt, as they will soon work loose if not so fastened. The crank should never be keyed into the shaft, but fastened on to a square head; or, what is better, shrunk into the shaft. The ingenious way of supporting lanterns on the machine, is a waste of time and expense; better some kind of clamps to secure a light umbrella in front, when the sun shines hot, or it rains; and clamps for fastening a travelling bag or shawl in the rear, particularly if one looks forward to country excursions and summer trips. ADVICE TO THE BEGINNER. To those who have never seen the two-wheeled velocipede in use, it seems surprising that the rider can keep his equilibrium. The principle of the thing is the same as that of the movement of a boy’s hoop. As long as the hoop revolves rapidly, its tendency to any lateral movement is almost suspended, and the greater the speed the less the difficulty in maintaining the upright position. At first sight one supposes it to be a formidable undertaking to mount and steer the bicycle. To learn to manage it, however, requires no more skill, courage, or patience, than to learn the art of skating; and when the art is once acquired, it provides a means of locomotion and a source of enjoyment as much more available than skating, as the number of days in the year is greater than the few bright mornings when one can find a smooth, glassy, and well-frozen skating ground. “Velocipedestrianism” is fully the equal of skating and horseback riding, in its invigorating and exhilarating effects. The velocipede bears young and old, light and heavy, easily and pleasantly and with equal facility. In learning the velocipede, it is advisable to use a machine of only moderate height, so that the soles of the feet can readily touch the ground. At the best school we know, where the pupils graduate experts, six different sizes of machines are used. The beginner is put upon one with a guiding wheel of a diameter of only thirty-four inches, and is promoted from one to another, according to progress.