state in which it had been
left.

"Have we been deceived by an illusion?" murmured Cyrus Harding.

No! that was not possible! The telegram had clearly said,--

"Come to the corral immediately."

They approached the table specially devoted to the use of the wire.
Everything was in order--the pile on the box containing it, as well as
all the apparatus.

"Who came here the last time?" asked the engineer.

"I did, captain," answered Ayrton.

"And that was--"

"Four days ago."

"Ah! a note!" cried Herbert, pointing to a paper lying on the table.

On this paper were written these words in English:--

"Follow the new wire."

"Forward!" cried Harding, who understood that the despatch had not been
sent from the corral, but from the mysterious retreat, communicating
directly with Granite House by means of a supplementary wire joined to
the old one.

Neb took the lighted lantern, and all left the corral. The storm
then burst forth with tremendous violence. The interval between each
lightning-flash and each thunder-clap diminished rapidly. The summit
of the volcano, with its plume of vapor, could be seen by occasional
flashes.

There was no telegraphic communication in any part of the corral between
the house and the palisade; but the engineer, running straight to the
first post, saw by the light of a flash a new wire hanging from the
isolator to the ground.

"There it is!" said he.

This wire lay along the ground, and was surrounded with an isolating
substance like a submarine cable, so as to assure the free transmission
of the current. It appeared to pass through the wood and the southern
spurs of the mountain, and consequently it ran towards the west.

"Follow it!" said Cyrus Harding.

And the settlers immediately pressed forward, guided by the wire.

The thunder continued to roar with such violence that not a word could
be heard. However, there was no occasion for speaking, but to get
forward as fast as possible.

Cyrus Harding and his companions then climbed the spur rising between
the corral valley and that of Falls River, which they crossed at its
narrowest part. The wire, sometimes stretched over the lower branches
of the trees, sometimes lying on the ground, guided them surely. The
engineer had supposed that the wire would perhaps stop at the bottom of
the valley, and that the stranger's retreat would be there.

Nothing of the sort. They were obliged to ascend the south-western spur,
and re-des