Figure 1 is a plan view of a section of Terry's cast-iron pavement, and fig. 2 a perspective view of a block of it. It is the invention of W. D. Terry, of Boston. The nature of the invention consists in covering the surlace of a street with boxes made of iron of any convenient form and size, and divided into sections, so small as not to admit the hoof of a horse, and the compartments of iron are so arranged as to strengthen one another, and the whole pavement. The boxes are grooved in such a manner as will j,effec- j tually prevent the feet of horses and the' wheels of carriages from slipping. The box- ; es keyed together, as shown in fig. 1, and the, interstices are filled with any composition: made of stone and shells, c, and held together by any suitable cement. Fig. a shows the cast-iron box or block for a pavement, ready to be laid down upon the earth. It is of a cylindrical form. A represents, the interstices between the blocks when laid down, and als 3 the interstices or hollow parts . cast in each box. B is the outside circular rim of each box, and C represents the grooves spoken of in the rim, radial partitions or ribs, and inside circular rim. The ribs and rims extend to the bottom of each box, and the interstices also extend down. Each box has outside flanges for the purpose of keying one into the other, as shown in fig. 1, so as to render the whole immovable and firmly keyed in position. Each block is about five inches deep, and one foot in diameter, but a larger size may be employed. Each I block may be made with any number of compartments in it. The thickness of the rims and ribs in each block is about one inch at the top, and this thickness extends about one inch down, then tapers to a thin rim at the bottom. It will be observed, in fig. 1 there are dark notches in some of the projections, these are clefts for the reception of the key of the ;:ext block. The keys or flanges, and the clefts or commissures are so arranged around the outside of each box, that each key rests in a commissure of the neighboring box, and thus, as represented, each box rests upon the ground, and is also supported by three other boxes, which it also aids in supporting. Thus the whole pavement is firmly linked together, and it is impossible for any one box to move or rise above or settle lower than those around it. This is the iion pavement which has been laid down, and has been successfully tried in Boston. It evidently appears to be an excellent invention for the purpose intended, and we hope that all doubts as to its economy and practicability have been fully dissipated. More information may be obtained by letter addressed to J. Atkinson, Esq., No. 81 Washington st., Boston.