I have said that the Baherein has been esteemed the place whence the greatest quantity of pearls are brought. I would be understood to mean, that this has been the reputed greatest regular market from antiquity to the present time. But Americus, in his second navigation, says, that he found an unknown people of that continent, who sold him above 54 pound weight for 40 ducats[97]. And Peter the Martyr says, that Tunacca, one of the kings of that country, seeing the great desire the Spaniards had for pearls, and the value they set upon them, sent some of his own people in search of them, who returning the fourth day, brought with them 12 pounds of pearls, each pound 8 ounces. If this is the case, America surely excells both Africa and Asia in the quantity of this article. The value of pearls depends upon size, regularity of form, (for roundness is not always requisite) weight, smoothness, colour, and the different shades of that colour. Suetonius says, that Cæsar gave to Servilia, Marcus Brutus’s mother, a pearl worth about L. 50,000 of our money. And Cleopatra, after vaunting to her lover, Mark Antony, that she would give him a supper which should cost two hundred and fifty-thousand pounds, for this purpose dissolved one of the pearls which she carried in her ears, which amounted to that price, and drank it. The other, it is said, was carried afterwards to Rome by Augustus Cæsar, sawn in two, and put in the ears of Venus Genetrix. The price of pearls has been always variable. Pliny seems to have over-rated them much, when he says they are the most valuable and excellent of all precious stones. He must probably have had those just mentioned in his view, for otherwise they cannot bear comparison with diamonds, amethysts, rubies, or sapphires. It has been observed to me by the pearl fishers in the east, that when the shell is smooth and perfect, there they have no expectation of a pearl, but are sure to find them when the shell has begun to be distorted and deformed. From this it would seem, as the fish turned older, the vessels containing the juice for forming the shell, and keeping it in its vigour, grew weak and ruptured; and thence, from this juice accumulating in the fish, the pearl was formed, and the shell brought to decay, perfectly in the manner, as I have before said, supposed by M. Reamur.