The first person at Rome who covered the whole of the walls of his house with marble, according to Cornelius Nepos,[2489] was Mamurra,[2490] who dwelt upon the Cælian Hill, a member of the equestrian order, and a native of Formiæ, who had been præfect of the engineers under C. Cæsar in Gaul. Such was the individual, that nothing may be wanting to the indignity of the example, who first adopted this practice; the same Mamurra, in fact, who has been so torn to pieces in the verses of Catullus of Verona. Indeed, his own house proclaimed more loudly than Catullus could proclaim it, that he had come into possession of all that Gallia Comata had had to possess. For Nepos adds, as well, that he was the first to have all the columns of his house made of nothing but solid marble, and that, too, marble of Carystus[2491] or of Luna.[2492] CHAP. 8.—AT WHAT PERIOD THE VARIOUS KINDS OF MARBLE CAME INTO USE AT ROME. M. Lepidus, who was consul with Q. Catulus, was the first to have the lintels of his house made of Numidian marble, a thing for which he was greatly censured: he was consul in the year of Rome, 676. This is the earliest instance that I can find of the introduction of Numidian marble; not in the form of pillars, however, or of slabs, as was the case with the marble of Carystus, above-mentioned, but in blocks, and that too, for the comparatively ignoble purpose of making the thresholds of doors. Four-years after this Lepidus, L. Lucullus was consul; the same person who gave its name, it is very evident, to the Lucullan marble; for, taking a great fancy to it, he introduced it at Rome. While other kinds of marble are valued for their spots or their colours, this marble is entirely black.[2493] It is found in the island of Melos,[2494] and is pretty nearly the only marble that has taken its name from the person who first introduced it. Among these personages, Scaurus, in my opinion, was the first to build a theatre with walls of marble: but whether they were only coated with slabs of marble or were made of solid blocks highly polished, such as we now see in the Temple of Jupiter Tonans,[2495] in the Capitol, I cannot exactly say: for, up to this period, I cannot find any vestiges of the use of marble slabs in Italy. CHAP. 9.—THE METHOD OF CUTTING MARBLE INTO SLABS. THE SAND USED IN CUTTING MARBLE. But whoever it was that first invented the art of thus cutting marble, and so multiplying the appliances of luxury, he displayed considerable ingenuity, though to little purpose. This division, though apparently effected by the aid of iron, is in reality effected by sand; the saw acting only by pressing upon the sand within a very fine cleft in the stone, as it is moved to and fro.