Note 2659 — BOOK IX. THE NATURAL HISTORY OF FISHES.

“It was because pearls are calcareous, that Cleopatra was able to dissolve hers in vinegar, and by these means to gain a bet from her lover, as we are told by Pliny, B. ix. c. 58, and Macrobius, Sat. B. ii. c. 13. She must, however, have employed stronger vinegar than that which we use for our tables; as pearls, on account of their hardness and their natural enamel, cannot be easily dissolved by a weak acid. Nature has secured the teeth of animals against the effect of acids, by an enamel covering, which answers the same purpose; but if this enamel happens to be injured only in one small place, the teeth soon spoil and rot. Cleopatra, perhaps, broke and pounded the pearls pearl; and it is probable that she afterwards diluted the vinegar with water, that she might be able to drink it; though dissolved calcareous matter neutralizes acids, and renders them imperceptible to the tongue. That pearls are not peculiar to one kind of shell-fish, as many believe, was known to Pliny.” Beckmann’s History of Inventions, vol. i. p. 258, note 1, Bohn’s Ed. We may remark, however that as the story is told by Pliny, there is no appearance that Cleopatra pounded the pearl. It is more likely that she threw it into the vinegar, and immediately swallowed it, taking it for granted that it had melted.