Note 2 — XII MOLLE TARENTUM

Nor is there any of the fashionable verde antico, and this points in the same direction. Corsi says nothing as to the date of its introduction, and I have not read the treatise of Silenziario, but my own observations lead me to think that the lapis atracius can hardly have been known under Tiberius. Not so those hard ones: they imported wholesale by his predecessor Augustus, who was anxious to be known as a scorner of luxury (a favourite pose with monarchs), yet spent incalculable sums on ornamental stones both for public and private ends. One is struck by a certain waste of material; either the expense was deliberately disregarded or finer methods of working the stones were not yet in vogue. A revolution in the technique of stone-cutting must have set in soon after his death, for thenceforward we find the most intractable rocks cut into slices thin as card-board: too thin for pavements, and presumably for encrusting walls and colonnades. The Augustans, unable to produce these effects naturally, attempted imitation-stones, and with wonderful success. I have a fragment of their plaster postiche copying the close-grained Egyptian granite; the oily lustre of the quartz is so fresh and the peculiar structure of the rock, with its mica scintillations, so admirably rendered as to deceive, after two thousand years, the eye of a trained mineralogist.