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Ch. 6:Other Gems

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424
A POPULAR TREATISE ON GEMS.
Corals are principally used for ornaments, in the East Indies, China, and Africa, where they are preferred to the diamond. Almost every East India lady wears a bracelet or necklace of corals.
The white coral has its origin from the eight-star coral (madrepora occulta); and the black coral from the black-horned coral (gorgonia antipothes). The medusa head {caput medusae), called the sea polen, belongs likewise to the coral family, and consists of sixty-two thousand six hun­dred and sixty-six articulated members.
Corals are fished for on the coast of Barbary, between Tunis and Algiers; in the latter state Bona is the principal station; the French have one also at Basteon de France.
The monopoly was purchased by France, in the seven­teenth century, at eighteen thousand dollars annually; and by England, since 1806, for fifty thousand dollars.
At. Bona there is a summer fishery, from the first of April to the first of October, which occupied, in 1821, thirty French, seventy Sardinian, thirty-nine Tuscanian, ' eighty-three Neapolitan, nineteen Sicilian barks; alto­gether, two hundred barks of two thousand and twenty-three tons capacity, with two thousand two hundred and seventy-four men; they fished up forty-four thousand two hundred pounds of coral, valued at two million four hun­dred thousand francs. The winter fishery of the same year occupied three French barks, each with nine men, and they obtained six hundred and eighty pounds of coral.
The principal manufactories of corals are now at Leg­horn, where this branch of business has been carried on for two hundred years past, by the Jews. There were for­merly twenty establishments, but the number has lately been much diminished.
They are sent principally to China, the East Indies, and Arabia, partly by the way of London, and partly by Mos-
Ch. 6:Other Gems Page of 515 Ch. 6:Other Gems
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