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Its main peculiarity is in the fumaroles, or escapes of steam, and mofetti, mephitic emanations of limpid water and sulphur-vapour. Of these we counted five narices within as many hundred yards. Their temperature greatly varies, 109 deg. and 158 deg. Fahr. being, perhaps, the extremes; my thermometer showed 130 deg.. These soupiraux or respiradouros are easily explained.
The aqueous vapours exhaled by the Narices and crevices of the crater, are only those same waters heated by the interior surfaces down which they flow. We had yet to scale the steepest part of the mountain, the Piton, which forms the summit.
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