followed the river until we reached an inaccessible mountain gorge which seemed to bar our further progress. But, by diverting our course some miles to the northward, we were able to ascend to the upper reaches of the river, and, here, to my delight, I found the banks and rapids studded with great green masses of olivine rocks.
"I was anxious to examine these rocks, which extended up the mountain side, and my companions agreed with me that it was advisable to leave the bed of the river for the spur of the mountains where the river apparently took its rise. We crossed the stream, and commenced a gradual but oblique ascent of the spur. But after climbing for some hours we found our further progress stopped by a wide and deep gully, a sinister place, full of masses of dark green rocks. At the foot of one of the largest of these rocks we came across a large hole descending almost perpendicularly into the earth.
"We lit our lamps and descended. After some scrambling we found ourselves on a landing-place, from which another low passage of an easier gradient led into a large cave in the solid rock.
"The surface underneath our feet was covered with a dust so fine that it slipped from beneath us like sand, and rose in thick clouds about us. The cave was high enough to walk upright in, and seemed to run a great distance, with many lateral passages and smaller recesses off the principal chamber. Moynglass entered one of these passages and disappeared from view. A few moments afterwards we heard him, in a very excited voice, calling us to follow him.
"We proceeded stooping, in Indian file, down the passage, and found Moynglass in a smaller cave at the end of it, staring intently at something which was at first difficult to see in the gloom. Then, by the light of our lamps, we made out a sapling sticking up between two rocks, with a withered human hand impaled on it by a rusty sheath knife.
"As I was examining it, one of my companions, who had been exploring the cave, gave a cry of astonishment which caused me to look round. In a corner of the cave, revealed by his lamp, lay two skeletons side by side. The hand of one skeleton was missing, and in the eye of the other there gleamed a large uncut ruby. We examined the skeletons and searched the cave, but found nothing to throw any light on the mystery or reveal any clue of identity. There was not a vestige of food or clothing around the remains, and not a scrap of writing—only the two crumbling skeletons, the sapling, the sheath knife, and the ruby.
"What had brought about such a tragedy in the dim recesses of that prehistoric cave? Who could say? Perhaps the men had been prospecting together, and one had found the ruby and hidden in the cave, where his companion had found him and cut off his right hand with some primitive idea of making his vengeance fit the crime. Then, perhaps, they had been unable to escape from the cave, and had died together of thirst and hunger. But what is the use of speculating? The secret must ever remain hidden in the cave where the skeletons still lie."
Musard stopped abruptly, and sat staring straight in front of him. His strange eyes had a fixed look, as if gazing into the distance. His brown hand rested lightly on the white tablecloth, and the great ruby on his little finger gleamed fitfully in the light.
"You haven't told us all the story yet," said Phil Heredith quietly.
The other looked doubtfully at the ring of intent faces regarding him. "I left that part untold for a good reason," he admitted. "It is—well, I thought it a little bit too horrible to relate."
"Oh, do tell us," said the lady journalist enthusiastically. "We are all dying to hear it. It is such an unusual and exciting story that it would be cruel to leave us in suspense about the end."
"Very well, then," said Musard, as the other ladies chorused their approval. "We left the cave, and Moynglass, who considered himself the leader of the expedition, put the ruby in his pocket. That night we camped at a wild desolate spot, not far from the edge of a cliff about two hundred feet high, at the foot of which the bitter sulphurous waters of the river flowed into a chasm. In the morning we found Moynglass lying dead in his blanket, with the rusty sheath knife he had brought away from the cave sticking in his breast. The ruby was gone, and, so, also, was the eldest member of our party—an elderly dark-faced Irishman named Doyne, who, the previous day, had angrily disputed Moynglass's right to carry the ruby.
"We searched for Doyne all that day, but could find no trace of him. The next day we tracked across a glacier-like expanse littered with large blocks of sandstone. It was a grim spot. A horrible, stony, treeless waste which might have been the birthplace of the earth and the scene of Creation—a tableland between great mountains, full of masses of rhodonite contorted into grotesque shapes of stone images; a place where our lightest whispers came shouting back out of the profound stillness from the huge castellated black rocks bristling on the edge of a precipice which slit the valley from end to end.
"It was there we found Doyne, staggering along the lip of the gorge. He had gone mad in the solitude, and was wandering along bareheaded, tossing his arms in the air as he walked. When I saw him I thought of Cain trying to escape from the wrath of God after killing Abel. He saw us as soon as we saw him, and started to run. We set out in pursuit, but he fled with great speed, leaping from rock to rock like a mountain goat. He was getting away from us when he slipped and fell into the chasm with a loud cry. We found a path down the precipice and descended, and discovered him at the foot, battered to death, with the ruby clutched in his hand. That ended the expedition. The others insisted on returning to the coast without delay, and when we arrived there they gladly sold their shares in the ruby to me."
There was rather a long silence when the explorer had finished his narration. The long hand of the clock on the mantelpiece was creeping past the half-hour, but the circle round the dining-room table had been so enthralled by the story that nobody had noted the passage of time.
"What a ghastly adventure, Mr. Musard!" began one of the ladies, with a mirthless little laugh. "Did you never discover anything more about the two dead men in the cave?"
"No," replied Musard. "As I said, there were no papers or any clue to throw light on their identity. The skeletons must have lain there for many years, for the bones were crumbling into decay."
"You have never revisited the spot?" asked Sir Philip.
"I was in the Ureweras two years later with a Maori guide, investigating copper deposits for the New Zealand Government, but I did not go back to the valley."
"Would it not have been possible to give the poor things—the skeletons, I mean—Christian burial?" Mrs. Spicer asked timidly.
"It was impossible to dig a grave in the solid rock. Besides, they have a sepulchre of Nature's which will outlast any human grave," replied Musard.
"The thing that puzzles me is how the ruby got into the skeleton's eye," remarked the lady journalist musingly. "If that was the skeleton of the man who killed the other for stealing the ruby, who placed the ruby where you found it? Obviously, he could not have done it himself, for it must have been put there after death. Who, then, could it have been?"
"I have no idea," said Musard, in a tone which suggested that he did not care to discuss the subject further.
"May I look at the ring?" Miss Garton asked.
Musard drew it off his finger and handed it to her in silence. The others wanted to see it, so it was passed from hand to hand round the table, to the accompaniment of many admiring comments on the size and beauty of the stone. One of the young officers, with an air of much interest, asked Musard whether he thought there were other rubies like it to be found near the spot.
"Hardly in that form," replied Musard. "It is a puzzle to me how the men who found the ruby managed to get it out of the ruby rock and partially polish it. They had no tools or instruments of any kind—at least, we found none in the cave. Undoubtedly there are rubies in that part of the world. It was near the valley that Moynglass found his sample of corundum, with a ruby crystal in it. On our way back, at the head of the valley, I came across a belt of magnesian rocks charged with ores of copper and iron, and probably containing the matrix of ruby crystals."
"I wonder you wear the thing," said the chubby-faced youth of the Flying Corps, handing the ring across the table to the explorer.
"Why not?" asked