Ea utraque sunt ideo firma, primum quod ipsa caementa sunt spissa et solida proprietate neque de materia possunt exsugere liquorem, sed conservant ea in suo umore ad summam vetustatem; ipsaque eorum cubilia primum plana et librata posita non patiuntur ruere materiam, sed perpetua parietum crassitudine religata continent ad summam vetustatem.
Both are firm, for the reason especially that the rubble itself is of a thick and solid property, and cannot suck out the moisture from the mortar; the rubble preserves the mortar with its moisture for a long time; and the bed-joints of the stone, being laid flat and levelled, do not allow the mortar to sink down; but the stones being bonded in the unbroken thickness of the walls, keep the mortar together for a long time.
final_alignments\Vitruvius_Architecture_Book_2.json