Again, Pliny in the chapter on Lysistratus—which it must be remembered is devoted to modeling—mentions one fact which seems to be inconsistent with any knowledge at that time of casting. Arcesilaus, he says, modeled a drinking-cup or mixing-bowl in plaster, which he sold to Octavius, a Roman knight,[23] for a talent (£250). It is impossible to believe that such an enormous price would have been given for a mere plaster bowl. If the process of casting from it was then understood, Arcesilaus might have repeated it in cast a thousand times, and the original and the cast being in the same material, one would have been quite as good as the other, if retouched. Yet he seems only to have made one, and to have asked a talent for that. Again, Lucullus made a contract with this same artist to model for him in plaster a statue of Fabatus, for which he agreed to pay him no less than 60,000 sesterces, or £530. It is worth noting, too, as a curious fact, that just at the very time when Lysistratus is supposed to have invented plaster-casting, the art of brass-casting began to decline in character and style, and soon after seems to have died out and been lost; at all events, Pliny tells us that soon after the 120th Olympiad the art perished,—“cessavit deinde ars.” And as Lysistratus lived only about twenty-five years previously, it would be singular to find one of these arts dying out just as the other was being developed. Mr. Perkins also thinks it valuable to tell us that Canova was of opinion that the sculptors of antiquity made finished sketches, and then by means of proportional compasses enlarged them and took points on the marble; and he adds, “We should weigh these words of a great sculptor who devoted himself to the most minute researches on this subject, as well as to everything that had relation to the fine arts.” We agree that we should weigh the words of this distinguished sculptor, though we were not aware before that he was a profound archæologist, or had made minute researches on this subject. But how in any way does this tend to prove that the ancient Greeks and Romans knew how to cast in plaster? We are equally unable to see the precise bearing on this question of the fact also stated by him, that the drill is supposed by some to have been invented by Callimachus, and by others to have been used long before; or that the pointing of a statue was probably known to the Greeks, and certainly to the Romans.