Two bicyclists, one a Londoner, the other an American geologist named Ward, out for a pleasant bicycle trip in the idyllic Thames valley, meet at a small village inn on the west bank of the Thames. Their parlor chat turns to the subjects of mountains and volcanic eruptions, and the difference between small vent-hole eruptions and large fissure eruptions. The Londoner speaks: "Let us be thankful," I said, carelessly, "that such things don't happen in our own times." He eyed me curiously. "Haven't happened, you mean," he answered. "We have no security that they mayn't happen again to-morrow. These fissure-eruptions, though not historically described for us, are common events in geological history - commoner and on a larger scale in America than elsewhere. Still, they have occurred in all lands and at various epochs; there is no reason at all why one shouldn't occur in England at present.
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