The difficulty experienced by inventors in the line of anti-vibrators appears to be, that while acquiring the desired elasticity in the proper direction an elasticity in other directions has followed, making the machine feel unsteady and capricious, especially in the steering. This undoubtedly valid difficulty in the way is worthy of careful consideration before accepting an anti-vibrator; in fact, the very end desired can easily be missed in an imperfect device, as it might, while holding momentum in one direction, lose it in another. I cannot better express my opinion as to the general requirement of a good anti-vibrator than to say, get plenty of spring, but acting in the plane of momentum and gravity, and get it as quickly as possible; that is, at the connection of the wheels with the forks, or at the outer end of the spokes if it can be done without interfering with the rigid transmission of power to the driving-rim. It is always difficult to apply any attachment to the driving-wheel of a machine; in the Ordinary it would be beneficial to attach an anti-vibrator to the forward wheel, but as a matter of construction it would be about as difficult to do this as it would be to attach it to the rear wheel of the Safety. We hope to see and may expect a number of devices to be offered by makers which will fulfil all requirements. Appended find a cut of one recently patented, of which I can speak with some confidence from having used a similar contrivance in experiments in this connection. The figure here, as in the patent, shows the connecting-rod swinging through an almost useless arc of action, but the general plan is good; not, however, as neat as some others. A great maker has of late, however, adopted a device which, to my mind, does _not_ fulfil all of the requirements; it is still confined too much to a vertical action, and has really no horizontal amplitude unless the machine is ridden by a very heavy man, in which case the spring will assume a very abnormal position.