[2493] The black marbles, Ajasson remarks, are comparatively rare. He is of opinion that the colour of the Lucullan marble was the noir antique of the French, and says that it is to be found at Bergamo, Carrara, Prato in Tuscany, and near Spa in Belgium.
[2494] “Chios” is another reading.
[2495] “Thundering Jupiter.” This temple was built by Augustus.
[2496] Ajasson says that his remarks on the choice of the sand for this purpose, are very judicious.
[2497] A recommendation worse than useless, Ajasson remarks.
[2498] For this purpose, at the present day, granular corindon, or yellow emery, is used, as also a mixture composed of the oxides of lead and of tin; the substance being repeatedly moistened when applied.
[2499] See Chapters [13] and [43] of this Book.
[2500] A city in Crete where the stone was prepared for use.
[2501] “Cotes.”
[2502] Books III. IV. V. and VI.