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fresh-water
mussels of Russia and of France. In 1849, Dr. Adolphe de Bauran
performed numerous experiments on the production of Pearls by the
mussels {Unto margaritifer) of the torrential stream of Vianz,
near Rhoder, in the department of Aveyron. His experiments were not
followed by any striking success. Even less successful were the
attempts to produce Pearls in the Unio littoralis, of the
Touch, near Toulouse, as conducted by MM. Mouquin-Tandon and Jules
Cioquet, who, in 1858, read a paper on this subject before the Société drAcclimatation of Paris.
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American River Pearls. In
many of the rivers flowing through the northern part of the American
Continent, the Pearl-mussel is abundant. Dr. Isaac Lea, of
Philadelphia, has catalogued many hundreds of species of American
river-mussels belonging to the genera Unio, Marga-ritana and Anadon. Yet
the occurrence of good Pearls in these shells does not appear to be
frequent. - *At any rate, the business of Pearl-fishing, involving as
it does, great expense in a country where the value of labour is high,
has not hitherto been a very remunerative industry.
River-Pearls have been systematically fished in the Miami river, in Warren county, Ohio. The
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