_Sir_: It has just been determined by the War Department that the substitution of wood for stone, in the superstructures of the bridges on the new piece of road around Wills hill would be deemed by the State of Maryland a substantial compliance with the requirements of her law giving assent to the change from the old to the present location of that part of the road. You will, therefore, build the abutments of those bridges in a good and durable manner, of the best stone to be had in your immediate neighborhood, and make the superstructure of wood. These last, when completed, must be well covered, and painted in the best manner. This is communicated in answer to your two letters of the 23d and 24th instant, on the subject, which are at hand. I am, &c., C. GRATIOT. Capt. R. Delafield, Corps of Engineers. Cumberland, Md. COPY OF INSTRUCTIONS SENT BY THE SUPERINTENDENT OF THE CUMBERLAND ROAD, EAST OF THE OHIO, TO EACH OF HIS ASSISTANTS ON THE LINE OF THE ROAD. WHEELING, May 29, 1834. _Sir_: In conducting the operations for repairing the section of the road under your supervision, during the present season, two very important alterations will be made in the system of last year. The first is to retain, in all cases, the old bed or pavement, breaking down with sledges the prominent or projecting pieces into the ruts and holes, and smoothing the grade with quarry chips, or stone broken on the face of the road with sledge-hammers, slightly covering the bed so prepared with the earth from the ditches, observing to put no more earth than is barely sufficient to prevent the metal coming in contact with the large stone of the bed. Where there is no stone in the old bed, restore the grade with the best and hardest material to be found in the vicinity, making it a point to have stone to fill the large holes. This formation of the bed for the metal on top of the old bed will enable large and sufficient ditches to be formed for carrying off the water. The most particular attention must be given to these ditches, as upon them depends the preservation of the road. All the earth taken from the ditches, side roads, and slopes, not required to make good the grade and side roads, must be thrown down the hill side, and on no account whatever upon the slope of a side hill cutting, from whence it soon washes back into the ditches. The minimum size of the ditches should not be less than three feet wide on top, one foot deep, and one foot wide in the bottom; the whole depth to be below the bed of the road. Rock and peculiar side slopes can alone prevent this being practiced. The side slopes must be cut to a slope of 45, with berms, as a minimum; and as low as 60 wherever it is practicable.