[2783] A white tufa, Vitruvius says, B. i. c. 7.
[2784] It was in reference, possibly, to this stone that Cicero made the remark, mentioned in Chapter [5] of this Book; the heat of Chios being so great, perhaps, that the Tiburtine stone could not have endured it.
[2785] A general name for Silica, Flint, or Quartz, and the several varieties.
[2786] See B. iii. c. 8.
[2787] See B. ii. c. 96, B. iii. c. 9, and B. xiv. c. 8.
[2788] Ajasson thinks that Travertine is meant; a tufa, or carbonate of lime, which is common in Tuscany.
[2789] “Built of stones of equal size.”
[2790] “Built of stones of unequal sizes.”
[2791] “Filled up work,” apparently.
[2792] The reading is very doubtful here: for the word seems to mean, in Greek, “From one wall to another.” “Diamicton”—“Mixed up,” is another reading.