than during the cold, still the warren yielded its accustomed quota, which might have fed all the colony in Lincoln Island.
Often during these excursions, Herbert talked with Gideon Spilett on the incident of the bullet, and the deductions which the engineer drew from it, and one day—it was the 26th of October—he said—
"But, Mr. Spilett, do you not think it very extraordinary that, if any castaways have landed on the island, they have not yet shown themselves near Granite House?"
"Very astonishing if they are still here," replied the reporter, "but not astonishing at all if they are here no longer!"
"So you think that these people have already quitted the island?" returned Herbert.
"It is more than probable, my boy; for if their stay was prolonged, and above all, if they were still here, some accident would have at last betrayed their presence."
"But if they were able to go away," observed the lad, "they could not have been castaways."
"No, Herbert; or, at least, they were what might be called provisional castaways. It is very possible that a storm may have driven them to the island without destroying their vessel, and that, the storm over, they went away again."
"I must acknowledge one thing," said Herbert, "it is that Captain Harding appears rather to fear than desire the presence of human beings on our island."
"In short," responded the reporter, "there are only Malays who frequent these seas, and those fellows are ruffians which it is best to avoid."
"It is not impossible, Mr. Spilett," said Herbert, "that some day or other we may find traces of their landing."
"I do not say no, my boy. A deserted camp, the ashes of a fire, would put us on the track, and this is what we will look for in our next expedition."
The day on which the hunters spoke thus, they were in a part of the forest near the Mercy, remarkable for its beautiful trees. There, among others, rose, to a height of nearly 200 feet above the ground, some of those superb coniferæ, to which, in New Zealand, the natives give the name of Kauris.
"I have an idea, Mr. Spilett," said Herbert. "If I were to climb to the top of one of these kauris, I could survey the country for an immense distance round."
"The idea is good," replied the reporter; "but could you climb to the top of those giants?"
"I can at least try," replied Herbert.
The light and active boy then sprang on the first branches, the arrangement of which made the ascent of the kauri easy, and in a few minutes he arrived at the summit, which emerged from the immense plain of verdure.
From this elevated situation his gaze extended over all the southern portion of the island, from Claw Cape on the south-east, to Reptile End on the south-west. To the north-west rose Mount Franklin, which concealed a great part of the horizon.
But Herbert, from the height of his observatory, could examine all the yet unknown portion of the island which might have given shelter to the strangers whose presence they suspected.
The lad looked attentively. There was nothing in sight on the sea, not a sail, neither on the horizon nor near the island. However, as the bank of trees hid the shore, it was possible that a vessel, especially if deprived of her masts, might lie close to the land and thus be invisible to Herbert.
Neither in the forests of the Far West was anything to be seen. The wood formed an impenetrable screen, measuring several square miles, without a break or an opening. It was impossible even to follow the course of the Mercy, or to ascertain in what part of the mountain it took its source. Perhaps other creeks also ran towards the west, but they could not be seen.
But at last, if all indication of an encampment escaped Herbert's sight, could he not even catch a glimpse of smoke, the faintest trace of which would be easily discernible in the pure atmosphere?
For an instant Herbert thought he could perceive a slight smoke in the west, but a more attentive examination showed that he was mistaken. He strained his eyes in every direction, and his sight was excellent. No, decidedly there was nothing there.
Herbert descended to the foot of the kauri, and the two sportsmen returned to Granite House. There Cyrus Harding listened to the lad's account, shook his head and said nothing. It was very evident that no decided opinion could be pronounced on this question until after a complete exploration of the island.
Two days after—the 28th of October—another incident occurred, for which an explanation was again required.
Whilst strolling along the shore about two miles from Granite House, Herbert and Neb were fortunate enough to capture a magnificent specimen of the order of chelonia. It was a turtle of the species Midas, the edible green turtle, so called from the colour both of its shell and fat.
Herbert caught sight of this turtle as it was crawling among the rocks to reach the sea.
"Help, Neb, help!" he cried.
Neb ran up.
"What a fine animal!" said Neb; "but how are we to catch it?"
"Nothing is easier, Neb," replied Herbert. "We have only to turn the turtle on its back, and it cannot possibly get away. Take your spear and do as I do."
The reptile, aware of danger, had retired between its carapace and plastron. They no longer saw its head or feet, and it was motionless as a rock.
Herbert and Neb then drove their sticks underneath the animal, and by their united efforts managed without difficulty to turn it on its back. The turtle, which was three feet in length, would have weighed at least four hundred pounds.
"Capital!" cried Neb; "this is something which will rejoice friend Pencroft's heart."
In fact, the heart of friend Pencroft could not fail to be rejoiced, for the flesh of the turtle, which feeds on wrack-grass, is extremely savoury. At this moment the creature's head could be seen, which was small, flat, but widened behind by the large temporal fossæ hidden under the long roof.
"And now, what shall we do with our prize?" said Neb. "We can't drag it to Granite House!"
"Leave it here, since it cannot turn over," replied Herbert, "and we will come back with the cart to fetch it."
"That is the best plan."
However, for greater precaution, Herbert took the trouble, which Neb deemed superfluous, to wedge up the animal with great stones, after which the two hunters returned to Granite House, following the beach, which the tide had left uncovered. Herbert, wishing to surprise Pencroft, said nothing about the "superb specimen of a chelonian" which they had turned over on the sand, but, two hours later, he and Neb returned with the cart to the place where they had left it. The "superb specimen of a chelonian" was no longer there!
Neb and Herbert stared at each other first, then they stared about them. It was just at this spot that the turtle had been left. The lad even found the stones which he had used, and therefore he was certain of not being mistaken.
"Well!" said Neb, "these beasts can turn themselves over, then?"
"It appears so," replied Herbert, who
