Orgues géologiques (plateau de Saint-Pierre de Maastricht, coupe copiée du Voyage souterrain de Bory de Saint-Vincent)
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1828
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La Grotte du Chien
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Le nom de cette grotte venait de la coutume qu'on avait d'utiliser un chien pour mettre en évidence la présence d'émanations toxiques près du sol. On le jetait ensuite dans le lac d'Agnano tout proche où il reprenait ses esprits.
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1691
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