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This phenomenon, analogous to that which I observed in the crater of Jorullo, deserves the more attention, as muriatic acid abounds in the greater part of volcanoes, and as M. Vauquelin has discovered it even in the porphyritic lavas of Sarcouy in Auvergne. I sketched on the spot a view of the interior edge of the crater, as it presented itself in the descent by the eastern break.
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