"Oh! no. Do let me stay up," she begged, entreatingly.
"But you must be tired—sleepy."
"Sleepy! who could sleep with such wonders going on around? Pray don't tell me to go to bed!"
It was evident that poor Kathy had the duty of obedience to authority still strong upon her. Perhaps the memory of the Holbein nursery had not yet been wiped out.
"Well, well," said the captain with a pathetic smile, "you are as safe—comfortable, I mean—here as in your berth or anywhere else."
As there was a lull in the violence of the eruption just then, the captain left Kathleen in the cabin and went on deck. It was not known at that time what caused this lull, but as it preceded the first of the four grand explosions which effectually eviscerated—emptied—the ancient crater of Krakatoa, we will give, briefly, the explanation of it as conjectured by the men of science.
Lying as it did so close to the sea-level, the Krakatoa volcano, having blown away all its cones, and vents, and safety-valves—from Perboewatan southward, except the peak of Rakata—let the sea rush in upon its infernal fires. This result, ordinary people think, produced a gush of steam which caused the grand terminal explosions. Vulcanologists think otherwise, and with reason—which is more than can be said of ordinary people, who little know the power of the forces at work below the crust of our earth! The steam thus produced, although on so stupendous a scale, was free to expand and therefore went upwards, no doubt in a sufficiently effective gust and cloud. But nothing worthy of being named a blow-up was there.
The effect of the in-rushing water was to cool the upper surface of the boiling lava and convert it into a thick hard solid crust at the mouth of the great vent. In this condition the volcano resembled a boiler with all points of egress closed and the safety-valve shut down! Oceans of molten lava creating expansive gases below; no outlet possible underneath, and the neck of the bottle corked with tons of solid rock! One of two things must happen in such circumstances: the cork must go or the bottle must burst! Both events happened on that terrible night. All night long the corks were going, and at last—Krakatoa burst!
In the hurly-burly of confusion, smoke, and noise, no eye could note the precise moment when the island was shattered, but there were on the morning of the 27th four supreme explosions, which rang loud and high above the horrible average din. These occurred—according to the careful investigations made, at the instance of the Dutch Indian Government, by the eminent geologist, Mr. R.D.M. Verbeek—at the hours of 5.30, 6.44, 10.2, and 10.52 in the morning. Of these the third, about 10, was by far the worst for violence and for the wide-spread devastation which it produced.
At each of these explosions a tremendous sea-wave was created by the volcano, which swept like a watery ring from Krakatoa as a centre to the surrounding shores. It was at the second of these explosions—that of 6.44—that the fall of the mighty cliff took place which was seen by the hermit and his friends as they fled from the island, and, on the crest of the resulting wave, were carried along they scarce knew whither.