"I emphasise the fact," continued the hermit after a pause, "first, because, although this has been a quiescent volcano since the year 1680, and people have come to regard it as extinct, there are indications now which lead me to believe that its energy is reviving; and, second, because this focus where fissures cross each other—this Krakatoa Island—is in reality part of the crater of an older and much larger volcanic mountain, which must have been literally blown away in prehistoric times, and of which Krakatoa and the neighbouring islets of Varlaten, Polish Hat, Lang Island, and the rest, are but the remnants of the great crater ring. If these rumblings and minor earthquakes, which I have noticed of late—and the latest of which you have just experienced—are the precursors of another explosion, my home here may be rendered untenable."

"Hi!" exclaimed Moses, who had been listening with open mouth and eyes to this discourse, which was obviously news to him, "I hope, massa, he ain't a-gwine to 'splode to-day—anyhow, not till after breakfast!"

"You must have studied the subject of volcanoes a good deal, I suppose, from what you say," observed Nigel.

"Naturally; living as I do almost on the top of one. My library, which I will show you presently, contains many interesting works on the subject. But come, if you have finished we will ascend the Peak of Rakata and I will introduce you to my sunshine."

He rose and led his guest back to the outer cavern, leaving Moses still busy with knife and fork, apparently meditating on the pleasure of breakfasting with the prospect of a possible and immediate explosion.

In passing through the first chamber, Nigel observed, in a natural recess, the library just referred to. He also noted that, besides stuffed birds and other specimens and sea-shells, there were chisels, saws, hammers, and other tools, besides something like a forge and carpenter's bench in a side-chamber opening out of the large one, which he had not at first seen—from all which he concluded that the hermit was imbued with mechanical as well as scientific and literary tastes.

At the further and darker end of the outer cave there was a staircase, partly natural, and partly improved by art, which led upward into profound darkness.

"Let me take your hand here," said the hermit, looking down upon his guest with his slight but winning smile; "it is a rough and dark staircase. You will be apt to stumble."

Nigel placed his hand in that of his host with perfect confidence, and with a curious feeling—aroused, probably, by the action—of having returned to the days of childhood.

The stair was indeed rugged as well as winding, and so pitchy dark that the youth could not have advanced at all without stumbling, unless his host had held him all the way. At last a glimmer of light was seen in the distance. It seemed to increase suddenly, and in a few moments the two emerged from total darkness into dazzling sunshine.

When Nigel looked round him he saw that they had gained a plateau, high up on the very summit of the mountain, which appeared to be absolutely inaccessible by any means save that by which they had reached it.

"This is what I call my observatory," said the hermit, turning to his guest. "We have passed right through the peak of Rakata, and reached its northern side, which commands, as you see, a view of all the northern part of the island. I come here often in the night to study the face of the heavens, the moon, and stars, and meditate on their mysterious Maker, whose ways are indeed wonderful and past finding out; but all which must, in the nature of things, be right."

As this was the first mention that the hermit had made of the Creator, and the reference was one requiring more thought than Nigel had yet bestowed on it, he made no rejoinder.

"Have you studied astronomy, Mr. Roy?"

"No—at least not more of it than was needful for navigation. But pray, sir, do not call me Mr. Roy," said the youth, with a somewhat embarrassed air. "If I am to be your assistant and familiar companion for two or three months, I hope that you will agree to call me Nigel. Your man has done so already without asking leave!"

"I will, on one condition."

"And that is—?"

"That you also dispense with the 'Mr.' and 'sir,' and call me Van der Kemp."

"Agreed," said Nigel, "though it does not seem so appropriate in me as in you, considering the difference of our years."

"Look here," said the hermit, turning abruptly to a small wooden shed which had hitherto escaped the youth's observation, so covered was it with overhanging boughs and tropical creeping plants, "these are my astronomical instruments."

He pointed to a table in the hut on which stood several telescopes—and microscopes as well—one of the former being a large instrument, certainly not less than six feet long, with a diameter of apparently six or eight inches.

"Here, you see, I have the means of investigating the wonders of Nature in her grandest as well as her minutest scales. And there," he added, pointing to a couple of large reflecting mirrors in strong wooden frames, erected on joints in such a way that they could be turned in any direction,—"there you have the secret of my sunshine. One of these mirrors catches the sunshine direct and reflects it on the other, which, as you see, is so arranged that it transmits the rays down the natural funnel or chimney into the cave. By means of chains connected with the mechanism, and extending below, I can change the direction of the mirrors as the sun changes its place in the sky, without requiring to come up here."

"Very ingenious!" said Nigel; "but how do you manage when the mountain comes between you and the sun, as I see it cannot fail to do during some part of the day?"

"Simply enough," returned the hermit, pointing to a distant projecting cliff or peak. "On yon summit I have fixed four mirrors similar to these. When the sun can no longer be reflected from this pair, the first of the distant mirrors takes it up and shoots a beam of light over here. When the sun passes from that, the second mirror is arranged to catch and transmit it, and so on to the fourth. After that I bid good-bye to the sun, and light my lamp!"

Nigel felt an almost irresistible tendency to smile at this, but the grave simplicity of the man forbade such familiarity.

"Look yonder," continued the hermit, sweeping one of his long arms towards Sumatra, "in that direction runs the line of volcanic disturbance—the fissure of which I have already spoken. Focus this telescope to suit your sight. Now, do you see the little island away there to the nor'-west?"

"Yes."

"Well, that is Varlaten. I mentioned it when at breakfast. Sweep your glass round to the nor'ard, the little island there is Polish Hat, and you see Lang Island in the nor'-east. These, with Krakatoa, are merely the higher parts still remaining above water of the ring or lip of the ancient crater. This will give you some idea what an enormous mountain the original of this old volcano must have been. This island-mountain is estimated to have been twenty-five miles in circumference, and 10,000 to 12,000 feet high. It was blown into the air in 1680, and this island, with the few islets I have pointed out, is all that remains of it! Now, cast your eye down the centre of the island on which we stand; you see several cones of various sizes. These are ancient vents, supposed to be extinct—"

"But one of them, the one furthest away," interrupted Nigel, steadying his telescope on the branch of a tree, "seems to be anything but extinct, for I see a thin column of white smoke or steam rising from it."

"That is just what I was going to point out. They call that Perboewatan. It is the lowest peak on the island, about 400 feet high, and stands, I should say, in the very centre of the ancient crater, where are the two fissures I have mentioned. For two hundred years Perboewatan has not smoked like that, and, slight though it is at present, I cannot help thinking that it indicates an impending eruption, especially when I consider that earthquakes have become more numerous of late years, and there was one in 1880 which was so violent as to damage seriously the lighthouse on Java's First Point."

"Then you have resided here for some time?" said Nigel.

"Yes, for many years," replied the hermit, in a low, sad tone.

"But is it wise in you to stay if you think an explosion so likely? Don't you needlessly run considerable risk?"

"I do not fear to die."

Nigel looked at his new friend in surprise, but there was not a shadow of boastfulness or affectation either in his look or tone.

"Besides," he continued, "the explosion may be but slight, and Perboewatan is, as you see, about four miles off. People in the neighbourhood of the straits and passing ships are so accustomed to volcanic explosions on a more or less grand scale that they will never notice this little cloud hanging over Krakatoa. Those who, like myself, know the ancient history of the island, regard it in a more serious light, but we may be wrong. Come, now, we will descend again and have a ramble over part of the island. It will interest you. Not many men have penetrated its luxuriant forests or know their secrets. I have wandered through them in all directions, and can guide you. Indeed, Moses could do that as well as I, for he has lived with me many years. Come."

Returning to the cavern they found that the active negro had not only finished his breakfast, but had washed the dishes and cleared up the kitchen, so that he was quite ready to shoulder a wallet and a gun when his master bade him prepare for a day in the forest.

It is not, however, our intention to follow the trio thither. Matters of greater interest, if not importance, claim our attention at present. Let it suffice to say, therefore, that after a most delightful day, spent in wandering amongst the luxuriant tropical vegetation with which the island was densely covered, visiting one of the extinct craters, bathing in one of the numerous hot springs, and collecting many objects of interest to the hermit, in the shape of botanical and geological specimens, they returned in the evening to their cavern-house not only ready but eager for sustenance and repose.