They were silent, irritated by the wait, and struggling with the absurd anxiety that oppressed them. They counted the seconds singly, by the beating of their hearts. It was interminable.

Three o'clock sounded from somewhere.

"You see," grinned M. Desmalions, in an altered voice, "you see! There's nothing, thank goodness!"

And he growled:

"It's idiotic, perfectly idiotic! How could any one imagine such nonsense!"

Another clock struck, farther away. Then the hour also rang from the roof of a neighbouring building.

Before the third stroke had sounded they heard a kind of cracking, and, the next moment, came the terrible blast, complete, but so brief that they had only, so to speak, a vision of an immense sheaf of flames and smoke shooting forth enormous stones and pieces of wall, something like the grand finale of a fireworks display. And it was all over. The volcano had erupted.

"Look sharp!" shouted the Prefect of Police, darting forward. "Telephone for the engines, quick, in case of fire!"

He caught Mazeroux by the arm:

"Run to my motor; you'll see her a hundred yards down the boulevard. Tell the man to drive you to Don Luis, and, if you find him, release him and bring him here."