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227 One of these, the largest fragment, struck the narrow space of soil between the Englishmen and the guide, not three feet from the spot where the former stood. Mervale uttered an exclamation of terror, and Glyndon held his breath, and shuddered.

"Diavolo!" cried the guide. "Descend, Excellencies — descend! we have not a moment to lose: follow me close!"

So saying, the guide and the peasant fled with as much swiftness as they were able to bring to bear. Mervale, ever more prompt and ready than his friend, imitated their example; and Glyndon, more confused than alarmed, followed close. But they had not gone many yards, before, with a rushing and sudden blast, came from the crater an enormous volume of vapour. It pursued — it overtook — it overspread them. It swept the light from the heavens. All was abrupt and utter darkness; and through the gloom was heard the shout of the guide, already distant, and lost in an instant amidst the sound of the rushing gust and the groans of the earth beneath. Glyndon paused. He was separated from his friend — from the guide. He was alone — with the Darkness and the Terror. The vapour rolled sullenly away; the form of the plumed fire was again dimly visible, and its struggling and perturbed reflection again shed a glow over the horrors of the path. Glyndon recovered himself, and sped onward. Below, he heard the voice of Mervale calling on him, though he no longer saw his form. The sound served as a guide. Dizzy and breathless, he bounded forward;