Abstract
PARIS. Academy of Sciences, August 17.—M. Marey in the chair.—On the copper mines of Sinai, worked by the ancient Egyptians, by M. Berthelot. These mines are near the coast of the Gulf of Suez, and are undoubtedly the most ancient known to history, having been worked at least 5000 years before the Christian era. They were abandoned about 3000 years ago, on account of the small amount of copper present in the ores. The reduction appears to have been carried out by methods not differing essentially from those in use at the present day, wood being used as the reducing agent, together with fusible silicates.—On the subject of a preceding communication, relating to some properties of primitive roots and secondary roots of prime numbers, by M. de Jonquiéres.
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Societies and Academies. Nature 54, 432 (1896). https://doi.org/10.1038/054432a0
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DOI: https://doi.org/10.1038/054432a0