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We saw nothing but the rough surfaces we trod. We pressed along crater-like edges, and all below was filled with mist, troubled and rushing upward like the smoke of a volcano. Up we went, nothing but granite and gray dimness. Where we arrived we know not. It was a top, certainly: that was proved by the fact that there was nothing within sight.
The phenomenon of the geyser serves in a measure to support the theory that steam is an important agent in volcanic action. A geyser, in fact, may be designated as a water volcano, since it throws up water only. It comprises a cone or mound, usually only a few feet high. In the middle of this is a crater-like opening with a passage leading down into the earth.
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