Jules Verne: Twenty Thousand Leagues Under the Seas

SECOND PART CHAPTER 2: A New Proposition from Captain Nemo (continued)

"On the fishing," the Canadian replied. "Before we tackle the terrain, it helps to be familiar with it."

"All right, sit down, my friends, and I'll teach you everything I myself have just been taught by the Englishman H. C. Sirr!"

Ned and Conseil took seats on a couch, and right off the Canadian said to me:

"Sir, just what is a pearl exactly?"

"My gallant Ned," I replied, "for poets a pearl is a tear from the sea; for Orientals it's a drop of solidified dew; for the ladies it's a jewel they can wear on their fingers, necks, and ears that's oblong in shape, glassy in luster, and formed from mother-of-pearl; for chemists it's a mixture of calcium phosphate and calcium carbonate with a little gelatin protein; and finally, for naturalists it's a simple festering secretion from the organ that produces mother-of-pearl in certain bivalves."

"Branch Mollusca," Conseil said, "class Acephala, order Testacea."

"Correct, my scholarly Conseil. Now then, those Testacea capable of producing pearls include rainbow abalone, turbo snails, giant clams, and saltwater scallops--briefly, all those that secrete mother-of-pearl, in other words, that blue, azure, violet, or white substance lining the insides of their valves."

"Are mussels included too?" the Canadian asked.

"Yes! The mussels of certain streams in Scotland, Wales, Ireland, Saxony, Bohemia, and France."

"Good!" the Canadian replied. "From now on we'll pay closer attention to 'em."

"But," I went on, "for secreting pearls, the ideal mollusk is the pearl oyster Meleagrina margaritifera, that valuable shellfish. Pearls result simply from mother-of-pearl solidifying into a globular shape. Either they stick to the oyster's shell, or they become embedded in the creature's folds. On the valves a pearl sticks fast; on the flesh it lies loose. But its nucleus is always some small, hard object, say a sterile egg or a grain of sand, around which the mother-of-pearl is deposited in thin, concentric layers over several years in succession."