Id autem licet animadvertere etiam de nonnullis monumentis, quae circa urbem facta sunt e marmore seu lapidibus quadratis intrinsecusque medio calcata: structuris vetustate evanida facta materia caementorumque exstructa raritate, proruunt et coagmentorum ab ruina dissolutis iuncturis dissipantur.
This we may observe from some tombs which are built near the city, faced with marble or squared stone, and, in the interior, constructed with walling material pressed down. The mortar becomes perishable in time and is drawn out through the loose joints of the rubble. Hence the tombs collapse and disappear when the union of the joints is broken by settlement.
final_alignments\Vitruvius_Architecture_Book_2.json