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    • The Fresh-Water Pearls of America - Nature

      Nature· 4 days ago

      THE production of pearls by numerous species belonging to the fresh-water bivalve family Unionidae has been a matter of common knowledge from time immemorial. Such pearl-bearing ...

    • Pearls and Pearling Life - Nature

      Nature· 4 days ago

      This is succeeded by a résumé of the ancient ideas respecting the origin and supposed medicinal qualities of pearls, and by a few words on “breeding” pearls. The writer then gives an account ...