This photo taken on May 7, 2025 shows an interior view of the Wieliczka Salt Mine in Wieliczka, Poland. The deposit of rock salt in Wieliczka has been mined since the 13th century. This major ...

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M. Margneritte, of Paris, well-known as a distinguished chemist, has discovered a valuable mode of purifying rock and sea salt. The latter is, for the most part, delivered for consumption in such ...