"The crater is on fire!" said Herbert, who, more active than his companions, first reached the plateau.
Mount Franklin, distant about six miles, now appeared like a gigantic torch, around the summit of which turned fuliginous flames. So much smoke, and possibly scoriæ and cinders were mingled with them, that their light gleamed but faintly amid the gloom of the night. But a kind of lurid brilliancy spread over the island, against which stood out confusedly the wooded masses of the heights. Immense whirlwinds of vapor obscured the sky, through which glimmered a few stars.
"The change is rapid!" said the engineer.
"That is not surprising," answered the reporter. "The reawakening of the volcano already dates back some time. You may remember, Cyrus, that the first vapors appeared about the time we searched the sides of the mountain to discover Captain Nemo's retreat. It was, if I mistake not, about the 15th of October."
"Yes," replied Herbert, "two months and a half ago!"
"The subterranean fires have therefore been smouldering for ten weeks," resumed Gideon Spilett, "and it is not to be wondered at that they now break out with such violence!"
"Do you not feel a certain vibration of the soil?" asked Cyrus Harding.
"Yes," replied Gideon Spilett, "but there is a great difference between that and an earthquake."
"I do not affirm that we are menaced with an earthquake," answered Cyrus Harding, "may God preserve us from that! No; these vibrations are due to the boiling of the central fire. The crust of the earth is simply the shell of a boiler, and you know that such a shell, under the pressure of steam, vibrates like a sonorous plate. It is this effect which is being produced this moment and is not an earthquake."
"What magnificent flames!" exclaimed Herbert.
At this instant a kind of bouquet of flames shot forth from the crater, the brilliancy of which was visible even through the vapors. Thousands of luminous sheets and barbed tongues of fire were cast in various directions. Some, extending beyond the dome of smoke, dissipated it, leaving behind an incandescent powder. This was ac-
