(2.) The fact of uneven wearing: one stone will be found soft next to a hard one; the former wears, leaving a pit which forms a pool for water in due course, and has to be removed. (3.) Unless very carefully bedded, a stone will see-saw; this is very unpleasant in wet weather, water accumulates beneath, and as the pedestrian treads on one end of the stone a squirt of dirty water up to his knees, and a stumble, remind him that the stone is loose. (4.) Liability to crack when any heavy goods are thrown upon it. The following specimen specification for Yorkshire flagging pavement may be of use. _Specimen Specification for Yorkshire Flagging Foot Pavements._ The old flagging (where and when directed) to be taken up, refaced, squared, and relaid. The new flagging is to be chisel-dressed to a fair face, true, out of winding, and not less than 3 inches thick,[106] to be properly squared and not pitched off only, or undercut, but to hold good to the square; to have not more than fourteen pieces to the hundred superficial feet; the joints must be set flush, and bedded and pointed with the best blue lias mortar. The bed for the flagging both old and new, if any is required, to be made with proper earth, gravel, or dry rubbish, and all surplus earth and rubbish to be carted from the streets as it arises from the works. The flagging to be properly cut and rebated to receive all area gratings, coal shoots, rain water troughs, &c. Any damage done to gas or water service pipes in digging for the flagging, or in any way connected with the work, to be made good by the contractor, as also all and every other damage to windows, wood, or glass work; and the contractor will be held responsible for, and will make compensation for any injury that the public may sustain through the negligence of his workmen, or otherwise. The whole of the flags to be of the very best quality, from Halifax, the quarries in the neighbourhood of Bradford or in Yorkshire, and subject to the approval of the surveyor. The contractor to provide all lights and proper guards at night, and when old paving is to be taken up the work is to be done under the direction of the surveyor, and if considered necessary, the stones are to be removed from the streets to be re-faced and squared. No stone to be stacked in the streets. The flagging to be measured after the work is completed. The contractor to provide all stone, materials, tools, implements, horse and cart hire, and pay all railway dues, freightages, etc., and also to provide all labour of every kind for properly completing the work to the full and entire satisfaction of the surveyor. Payment will be made as the work proceeds, on the certificate of the surveyor.