"You see all these volumes of steam, Axel; well, they demonstrate that we have nothing to fear from the fury of a volcanic eruption." "Am I to believe that?" I cried. "Understand this clearly," added the Professor. "At the approach of an eruption these jets would redouble their activity, but disappear altogether during the period of the eruption. For the elastic fluids, being no longer under pressure, go off by way of the crater instead of escaping by their usual passages through the fissures in the soil. Therefore, if these vapours remain in their usual condition, if they display no
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