3On this is placed a layer of stones, each of which is not to be less than will fill a man’s hand. These being spread, the pavement is laid thereon. If the rubbish be new, let three parts of it be mixed with one of lime; but if from old materials, the proportion is five parts to two of lime. It is then laid on, and brought to a solid consistence with wooden beaters and the repeated blows of a number of men, till its thickness is about three quarters of a foot. Over this is spread the upper layer, composed of three parts of potsherds to one of lime, of a thickness not less than six inches. Over the upper layer the pavement is laid to rule and level, whether composed of slabs or of tesseræ.
3Then, upon this lay the bedding, composed of stones not smaller than can fill the hand. After the bedding is laid, mix the broken stone in the proportions, if it is new, of three parts to one of lime; if it is old material used again, five parts may answer to two in the mixture. Next, lay the mixture of broken stone, bring on your gangs, and beat it again and again with wooden beetles into a solid mass, and let it be not less than three quarters of a foot in thickness when the beating is finished. On this lay the nucleus, consisting of pounded tile mixed with lime in the proportions of three parts to one, and forming a layer not less than six digits thick. On top of the nucleus, the floor, whether made of cut slips or of cubes, should be well and truly laid by rule and level.