With the aid of the rope and the pole, and the exertions of his friends, Gerald scrambled to a safe spot in the bushes, and then they all took a survey of the cave, or grotto, that lay below; and were so much interested by it, that they resolved to explore it at once. Jack volunteered to make the first expedition, and began by attaching the rope to a stout bush to facilitate his descent, and taking with him the pole to test the security of the ground below.
The floor of the cave was not more than twelve feet below the opening, and Jack looked round to find himself in a large grotto, floored with dry white sand; the rocky sides were garlanded with creeping plants, and it was lighted by many apertures above, similar to that through which Gerald had fallen, and, like that, almost covered with brushwood. Dark branch-caves ran from this airy grotto, into which they penetrated for a few yards, to satisfy themselves that it was uninhabited; and, from the observations he made, Arthur could not but believe the whole was of volcanic origin, and, in fact, a portion of the crater of an exhausted volcano.
"We may find a capital magazine here for the powder," said Jack; "and this light part will make a kitchen for the women folks while we are building the hut Think you, Mr. Arthur, I should make them a ladder? They'll hardly like swinging down by a rope."
Arthur thought they would certainly not like such a mode of descent, and the ladder was decided on. Then he ventured to draw near the screaming eagle to endeavor to extract the arrow from his wing, but the bird made such fierce returns for his kindness, that he was compelled to retreat, and wait for a more favorable moment for the operation; and in the mean time, the youths ascended to report the discovery of the cave.
Wilkins had been employed in cutting down and bringing up the ascent a quantity of the wild oats, and Margaret and her father were found standing by a pool of clear water, which, though now somewhat shallow, would doubtless contain an abundant supply after the rain. Around this pond Mr. Mayburn had found many new and beautiful flowers, and, as soon as he was satisfied of O'Brien's safety, he hastened to point out one of his most valued acquisitions.
"Observe, my dear children," said he, "one of the most curious plants ever discovered, Cephalotus follicularis, one of the pitcher-plants, so named from the peculiar-form of the delicate white blossoms. You perceive that these pitchers on the strong footstalk contain water—in this are some drowned insects. Hence, some writers have asserted that these flowers are used by the larger insects of prey as receptacles for their food. But we must see that this accumulated moisture is to preserve the plant in its beauty during the long dry season."
"Could we not plant potatoes here?" asked Margaret. "In this genial climate we might soon raise a crop, and our stock is now very low."
"Of course we can, Meggie," said Hugh. "I understand the habits of our solanum. This light, dry, fresh soil will exactly suit it. Come, Gerald, let us lose no time in marking off and clearing our potato-ground, before the rains stop us. That will be more useful than shooting eagles."
They were all gratified with the discovery of the cave, and anxious to see it, but were induced to wait till a ladder was made, which was to be commenced as soon as a party had returned to the wood to fill up the mouth of the tunnel. For this purpose they used part of the lopped branches, which they arranged so artfully, that no one could suspect a breach had been made. The remainder of the brushwood was to be conveyed up the mountain for firewood.
After this, Hugh and Gerald made a foray in an immense fig-tree, dispersing the feathered tenants, and carrying off a large stock of the ripe fruit. The rest returned, laden with firewood and wild oats. Then Jenny made them some tea, and cakes of bruised oats, mixed with the plentiful but insipid juice of the figs. These cakes were baked in the ashes, and much enjoyed by the ever keenly hungry boys, who named the dark hard biscuits Australian jumbles.