The inconvenience which often results from possessing only a one-seated buggy, or one that will only accommodate two persons, is, by the simple contrivance of this inventor— G. J. Lucas, of Poughkeepsie, N. Y.—entirely obviated, without adding many pounds to the weight of the vehicle.' He provides on the one set of wheels a single or double-seated buggy, one that will seat two or four persons, as occasion may demand. Our engravings represent a perspective view (Fig. 1), of the invention, and an outline section showing the change in position of the seats (Fig. 2). The frame or body of the vehicle, A, is constructed as usual, and mounted on wheels, B. There are two seats, C and D, C being capable of sliding under D, and so forming a one-seated buggy. The seats can be fixed in either position by screws, so that they will not shake from their position. These seats are connected together by means of link-work, which we will now describe. In the body, A, is a groove, e, in which the pieces, G, move, and as they are securely attached to the seat, D, they serve as guides for it, and keep it on the ways, b, on which it moves by means of a groove in the sides, H. In H is secured a pin, a, that passes through a slot in the piece, E, which moves around an axle pin, e, attached to the body, A, and the other end of E is connected with a piece, F, by a pin, c, and ward underneath the seat, D, as is also indicated by dotted lines, so that by moving D forward when there are two seats, only one seat will be obtained, and when there is only one seat, moving D backward will bring out C, making two seats. The seat, C, may be made to form a box for containing any necessary accompaniments to a vehicle, and this method of constructing buggies does in no way this piece, F, is attached to the seat, C, which slides inside the body, A, by means of a pin, d. It will be seen from this connection of parts that as the seat, D, is moved forward towards the dash-board, the lever, E, will assume the position indicated by the dotted lines, and the seat, C, will be pulled backinterfere with the graceful appearance of the vehicle. This plan of constructing seats of buggies was patented April 27, 1858, by the inventor, and assigned to himself and J. G. Lucas, of Poughkeepsie, N. Y., who may be addressed for any further information. A short notice of this invention appeared on page 276 of the present volume SCIENTIFIC AMERICAN.