It was near noon when the party entered a narrow ravine bordered on either side by vertical sandstone cliffs of about a hundred feet high, and here they came to a halt and pitched their camp; for no sooner had they fairly entered the ravine than they found themselves confronted by a splendid example of those extraordinary sculptured rocks which have excited the wonder and admiration of the few travellers in South America who have been fortunate enough to find them.

In the present case the sculptured rock consisted of a stretch of sandstone cliff about two hundred and fifty feet in length by about a hundred feet in height, practically vertical, the entire surface of which was covered with panels presenting a series of pictures portraying what appeared to be a genealogical record of certain customs and ceremonies, mostly of a religious character, of some gone and forgotten race of people. The work was executed in fairly high relief, and the drawing of the figures, of which there were thousands on the entire sculptured surface, evidenced artistic ability of a truly remarkable character, including a considerable knowledge of perspective. The panels portraying religious ceremonies indicated that the sun and fire were, or symbolised, the principal deities worshipped; and there was abundant evidence that human sacrifice was common. All this was, of course, absorbingly interesting to Earle, as was the light which the sculptures threw upon the personal appearance and costumes of the people portrayed. If the artist—or artists, for there must have been thousands of them to have produced such a magnificent and colossal piece of work—could be believed, the departed race boasted some exceptionally fine examples of male and female beauty, while the costumes bore more than a casual resemblance to those pictured on the ancient monuments of Egypt. Earle announced with finality that he intended to remain in camp on the spot, not only until he had minutely and exhaustively examined the sculptures, but also until he had photographed them as a whole and some separately. That probably meant at least a week’s sojourn where they then were.

The proposed arrangement suited Dick Cavendish admirably, for the prolonged halt appealed to him as something very much in the nature of a holiday, especially when Earle declared that he would need no assistance in his photographic operations, so that Dick would be free to amuse himself in any way he pleased. Dick was rapidly becoming as keen a naturalist, in a way, as Earle; once or twice, during the morning’s march, he had observed some particularly gorgeous butterflies flitting about, and he promised himself that he would spend at least a portion of his sojourn in the ravine in an endeavour to secure a few specimens. There was one duty, however, which he at once recognised must fall upon him, which was the supply of the camp with meat, and accordingly, upon the conclusion of the mid-day meal, when Earle started to get his photographic gear ready for the campaign among the sculptures, Dick took his rifle and, accompanied by two of the Indians, proceeded up the ravine in search of game. The country rapidly became wilder and more picturesque as they went,

to such an extent indeed that Dick quickly made up his mind to pay it another and more leisurely visit; and after about an hour’s tramp, which carried him into a labyrinth of rocks, he got a splendid shot at a creature strongly resembling a bighorn, which he neatly bowled over and with it triumphantly returned to camp.

On the fourth morning of the party’s sojourn in the ravine, Dick, accompanied as usual by two Indians, set out, immediately after breakfast, in search of meat for the day. Game was not particularly plentiful in that region, but the lad preferred to take his chance of finding something in his accustomed haunts, rather than tramp all the way back to the savannah, and accordingly he proceeded, as usual, right up the ravine, until he arrived at a point where a branch route led off toward the left. Hitherto he had not tried his luck in that particular direction, but he decided to do so now; and after about half an hour’s tramp, upon surmounting the crest of a ridge, he found himself looking down into a small circular basin, surrounded by rocky cliffs, the bottom of which was a smooth, grassy plain, in which, as luck would have it, several antelopes were grazing. The nearest of these, a fine fat buck to all appearance, was at least a thousand yards away, which was much too long a shot for Dick to risk; and he therefore set out to stalk the animal, leaving the Indians where they were to follow as soon as the buck should fall.

There were clumps of bush growing quite close up to the base of the encircling cliffs, offering admirable cover for stalking, as well as a certain amount of shelter from the sun’s scorching rays, and of these Dick gladly availed himself, ultimately succeeding in bringing down the buck with a three-hundred yard shot. Then, while waiting for the Indians to come and break up the quarry, the young man flung himself down in the shadow of a clump of bush to rest.

Stretched there at length in the cool, lush grass, with the great wall of sandstone cliff towering before him, it gradually dawned upon Dick that the enormous mass of rock upon which he was gazing must be that upon the opposite face of which were those wonderful sculptured pictures which Earle was doubtless at that moment busily engaged in photographing, and the thought caused him to regard the cliff with some interest. There were no sculptures upon it, but as Dick allowed his gaze to wander over the face of the cliff his quick eye detected a sort of crack some twenty feet above the surface of the ground, out of which, as he lay regarding it, there came fluttering one of those splendid butterflies, a specimen or two of which he was so eager to obtain; and he at once made up his mind that as soon as the Indians had broken up the buck and carried it away, he would explore that crack, which looked wide enough to allow him to squeeze his body through, and access to which seemed possible by way of a number of narrow ridges and projections in the face of the rock. Accordingly, as soon as the Indians had done their work and departed—Dick having informed them that he proposed to remain in the basin for a while and examine it thoroughly—he slung his rifle over his shoulder and started to climb the rock, reaching the crack with but little difficulty.

He found that the aperture was considerably larger than it had appeared to be when viewed from below and squeezed through it with ease, to find himself in the mouth of what looked like a cave, the dimensions of which, however, it was not possible to ascertain, for within a couple of yards of the entrance he found himself in darkness. But he saw enough to stimulate his curiosity and determine him to see more; and with this object he descended to the plain and, hunting about among the bushes, soon secured a sufficiency of dry twigs and branches to serve as torches. With these and a bit of dry moss he returned to the aperture in the face of the cliff, where, before entering, he ignited the moss with the aid of a powerful burning-glass which he habitually carried about in his pocket, and then, blowing the moss into flame, kindled one of his torches.

At first sight the cave appeared to be of very circumscribed dimensions, being only just high enough for Dick to stand upright in it, while he could touch both its sides at the same moment with his outstretched hands. But it extended back toward the heart of the cliff, and as the lad cautiously groped his way inward the crack gradually widened until at length he found himself traversing a spacious tunnel, piercing steadily deeper and deeper into the heart of the cliff. Determined now to see the full extent of the cave, and beginning to wonder whether perchance it pierced right through the rock, Dick pushed steadily on, oblivious of the fact that his stock of torches was rapidly diminishing; and when at length this fact was forced upon his attention by the necessity to kindle the last torch, it was far too late for him to think of returning, and feeling by this time convinced that there must surely be another outlet at no great distance, he set his teeth and pushed on, hoping to reach that other outlet before his last torch should be consumed. But the hope was vain, for in less than ten minutes Dick found himself in profound darkness, with still no indication of any other outlet than that by which he had entered.