The interior of the crater, whose inclination did not exceed thirty five to forty degrees, presented no difficulties nor obstacles to the ascent.  Traces of very ancient lava were noticed, which probably had overflowed the summit of the cone, before this lateral chasm had opened a new way to it.

As to the volcanic chimney which established a communication between the subterranean layers and the crater, its depth could not be calculated with the eye, for it was lost in obscurity.  But there was no doubt as to the complete extinction of the volcano.

Before eight o’clock Harding and his companions were assembled at the summit of the crater, on a conical mound which swelled the northern edge.

“The sea, the sea everywhere!” they cried, as if their lips could not restrain the words which made islanders of them.

The sea, indeed, formed an immense circular sheet of water all around them!  Perhaps, on climbing again to the summit of the cone, Cyrus Harding had had a hope of discovering some coast, some island shore, which he had not been able to perceive in the dark the evening before.  But nothing appeared on the farthest verge of the horizon, that is to say over a radius of more than fifty miles.  No land in sight.  Not a sail.  Over all this immense space the ocean alone was visible—­the island occupied the center of a circumference which appeared to be infinite.

The engineer and his companions, mute and motionless, surveyed for some minutes every point of the ocean, examining it to its most extreme limits.  Even Pencroft, who possessed a marvelous power of sight, saw nothing; and certainly if there had been land at the horizon, if it appeared only as an indistinct vapor, the sailor would undoubtedly have found it out, for nature had placed regular telescopes under his eyebrows.

From the ocean their gaze returned to the island which they commanded entirely, and the first question was put by Gideon Spilett in these terms: 

“About what size is this island?”

Truly, it did not appear large in the midst of the immense ocean.

Cyrus Harding reflected a few minutes; he attentively observed the perimeter of the island, taking into consideration the height at which he was placed; then,—­

“My friends,” said he, “I do not think I am mistaken in giving to the shore of the island a circumference of more than a hundred miles.”

“And consequently an area?”

“That is difficult to estimate,” replied the engineer, “for it is so uneven.”

If Cyrus Harding was not mistaken in his calculation, the island had almost the extent of Malta or Zante, in the Mediterranean, but it was at the same time much more irregular and less rich in capes, promontories, points, bays, or creeks.  Its strange form caught the eye, and when Gideon Spilett, on the engineer’s advice, had drawn the outline, they found that it resembled some fantastic animal, a monstrous leviathan, which lay sleeping on the surface of the Pacific.