"You mean that, even if we are not taken above and pulverised, we are in mortal danger here?" Forrester asked.

"Certainly; but not of instant death unless we make fools of ourselves.

The length of the process depends on your const.i.tution. Not one of those poor wretches yonder has been here more than four years, and that's exceptional. That young fellow, the last-comer--his name is Wing Wu, by the way: did you ever hear such a name?--he will hardly last out a year: he hasn't the stamina for it."

"But what is the mystery, then?" asked Forrester, astonished at the calmness with which this intrepid fellow seemed to envisage a certain death. "People have lived much longer than four years underground."

"Never in such a dungeon as this. Come with me."

He led Forrester across the cave until they came to a spot whence the floor shelved down steeply to the wall. That part of the wall which was below the general level of the floor was brightly luminous, and on its green surface Forrester saw, as on a screen, the shadowy forms of fishes and aquatic reptiles flitting hither and thither. Watching them curiously, he was astonished when, at one and the same moment, they dispersed with a rapidity betokening terror, some to the right, some to the left. For an instant the screen was left blank; then there appeared upon it a monstrous skeletonised form, somewhat resembling the fantastic creatures depicted on the walls of the Temple, and on the wall of his own cell. It combined in one shape all the most hideous features of the alligator, the rhinoceros, and the dog-fish immensely magnified.

Involuntarily Forrester started back as the figure came close up to the wall, and seemed to be looking through it, as the fish in an aquarium look through the gla.s.s of their tank. But it was a shape only; its eyes could not be seen.

"What is it?" Forrester asked in a whisper.

"I don't know," his companion responded. "It is not one of any of the species of ichthyosaurus that I have ever seen; but it is liker that reptile than to any other known creature."

"But isn't that extinct? Don't they find merely the fossil remains of it?"

"Who is to say that any creature is extinct? Scarcely a year pa.s.ses but some explorer finds, in some remote neglected region, what is to him a new type, but in reality, no doubt, dates back to an antiquity beyond computation. This hideous creature seems to be the last of his kind; I have seen no sign of a mate; and his extinction would not be much of a loss."

"How can we see him at all, through the wall--just as we saw you coming down here three days ago?"

"Does no explanation occur to you?"

"Well, of course I have heard of X-rays, and things of that kind; but----"

"Exactly. Excuse my interruption, but I know what you were going to say. You were going to speak of cathodes, and vacuum tubes, and phosph.o.r.escent screens, and----"

"I wasn't," said Forrester: "I never heard of them."

"It comes to the same thing," Beresford went on imperturbably; and Forrester felt a little sorry that the man of cheery good fellowship was for the time sunk in the man of science. "Here there is none of the elaborate apparatus of the experimenter; but Nature has been experimenting through ages beyond count. What do our men of science know of the real nature of the X-rays? Next to nothing. They can produce them, that is all. And here, before our eyes, we have phenomena produced, not by man, but by the Great Artificer of the universe. Those creatures are swimming in the lake which you skirted just now. Their images are cast in some marvellous way upon this particular portion of the wall. I know no more than you the explanation, but.... My dear fellow, pardon me: this is not a lecture room. Come, I have something more to show you."

They recrossed the cavern, which was as broad as it was high, and turning a corner, were confronted by the arch-like opening of a pa.s.sage.

It was much more brightly illuminated by green light than the cavern out of which it led. Pa.s.sing under the arch, the two men walked quickly up the pa.s.sage, which twisted to right and left at every few yards, and inclined gradually upward.

"I feel very rummy," said Forrester after a while: "the sort of tingling you have before a severe thunderstorm."

"I feel it too," his companion responded: "not so intensely as you, perhaps. The thing is to keep as tight a hold on yourself as you can--as you ought to have done when that old sinner above hypnotised you."

"But----"

"Now don't talk. We shall have plenty of opportunities of discussing him, and hypnotism, and a thousand and one things. Take a grip of yourself, and _will_ that the mephitic influence shall not affect you.

You won't thoroughly succeed, but the effort will be good."

The feeling of tenseness increased as they advanced. To Forrester it seemed as though a hot band were tightening round his temples; but he kept silence. Glancing at Beresford, he perceived on his face an expression of grim, almost savage, determination. They went on, the pa.s.sage becoming lighter moment by moment, until, after they had walked a few hundred yards, it widened out into a cavern, much less s.p.a.cious than that which they had left, but almost as light as open ground at noonday. At the edge of it Beresford halted.

"Stand here, and watch," he said.

In the centre of the floor there was a large square slab of some greyish substance--the only spot in the cavern through which the green rays did not, as it were, percolate. It was about three feet each way, and stood a few inches above the floor. Upon it lay a coil of thin yellow-green chain, like an immense bra.s.s watch-guard tinged with verdigris, and an oblong lump about a foot in length, and of the same colour. A few feet above, a stout bar of yellow metal projected from the wall of the cavern, having at its free end, exactly over the centre of the slab, a wheel over which another chain hung.

These objects first caught Forrester's attention, no doubt because they formed a group in the centre of an otherwise bare floor; but they held it only for a moment or two. His eyes were diverted to a living figure.

From a hitherto unnoticed recess on his left hand came a bent, decrepit, cadaverous Chinaman, to all appearance very old, carrying a thin square plate, in colour a dirty greenish-grey. He toddled slowly towards the slab, looking neither to right nor left, laid the plate upon it, and pa.s.sed through a hole in the centre of the plate what seemed to be a small catch in the aforesaid lump of metal. This latter he attached to the chain hanging over the wheel.

This done, he moved to one side, and standing at a distance of about ten feet from the slab, pulled at the chain which lay upon it, and which, as Forrester now saw, was fastened to a stout ring in its upper edge. The slab moved on hinges slowly towards the Chinaman, and as it rose from the floor, a shaft of pale green light, blinding in its brilliance, shot up to the roof, fourteen or fifteen feet above, causing the two Englishmen to start back and retreat some paces into the pa.s.sage.

Forrester was conscious of an intensification of his nervous excitement.

His ears buzzed; his skin tingled as if he were in an electric bath; his impulse was to cover his eyes and rush headlong to escape the terrible glare and its psychical accompaniment. But seeing Beresford venturing back by degrees, he exerted his will to the utmost, and followed him.

[Ill.u.s.tration: A shaft of pale green light, blinding in its brilliance, shot up to the roof.]

The Chinaman, who was probably at the outset less nervously organised than they, and was certainly inured to the conditions, was carefully paying out the chain over the wheel, with its weighted plate, into a hole in the floor. As Forrester now perceived, the two chains were one, which was much longer than had appeared when it was coiled up. When it was stretched to its full length, it rose vertically from the slab to the bar, ran through hooks in this for a few feet, then descended perpendicularly over the wheel. The Chinaman drew back, and leant against the wall in the relaxed att.i.tude of one waiting. To the Englishmen, in this overpowering atmosphere, the period of inaction seemed an hour: it was really about five minutes. Then the Chinaman approached the chain, taking care to remain as far as possible from the hole, and with careful deliberateness hauled it in, moving backward as he did so. Forrester waited with feverish impatience as it clinked inch by inch over the wheel. When at last the square plate came to the top, the Chinaman raised it until there was room for the slab to pa.s.s beneath it, and prevented it from slipping down over the wheel by hooking the chain to the wall, leaving, however, the greater part of the chain free.

Then, with a quickness all the more surprising because of his slow movements. .h.i.therto, he rushed with bent head at the slab, gave it one vigorous push, and darted back to the wall, catching at the chain in time to prevent the slab from falling violently. When it was settled in its place, and the blinding glare was shut off, the old man sank on the floor as if to rest after tremendous exertions.

At first Forrester felt a dull disappointment. Without a definite expectation, he had antic.i.p.ated some striking phenomenon as the result of this elaborate performance. The plate, whose upper surface was towards him, seemed after its long descent to be exactly as it was before: there was no change in it, nor had it brought anything up from the pit into which it had been plunged. But after a few minutes had pa.s.sed, the Chinaman turned it over, and Forrester was mildly surprised to perceive that the under surface had changed its colour. It was now greenish yellow, like the chain, the bar, and all the other parts of the machinery. In his half-dazed condition he did not suspect the extraordinary character of the transformation.

The Chinaman having reversed the plate, fastened it again to the chain, and went through the same series of careful movements as before. During the second period of waiting, Forrester, prompted by his companion, followed with his eyes the vertical path of the shaft of light from the hole to the roof. He noticed there an aperture, corresponding in size to the hole. A little fine dust was falling from this aperture, like soot from a chimney, into and around the opening of the pit, the minute particles dancing and glistening like the motes in a sunbeam.

When the plate came up the second time, its colour was the same on both sides. The Chinaman unhooked it, carried it across the cavern into the recess, and reappeared with a similar plate, dull and l.u.s.treless as the first had been.

Beresford drew Forrester away, and hurried him back through the pa.s.sage, saying nothing until they regained the larger cavern. Then he halted, clutched the lapels of Forrester's coat, and said:--

"Well, what do you think of that?"

"I don't understand," Forrester replied, something in his companion's manner convicting him of stupidity.

Beresford smiled.

"I don't wonder," he said. "You have seen what the alchemists from Trismegistus to Roger Bacon spent their lives in fruitless efforts to discover, and what Paracelsus would have given the world to see. You have seen lead trans.m.u.ted into gold! That is the Old Man of the Mountain's secret. Come along to my particular nook: I will tell you all I know."

CHAPTER XII

EXPLANATIONS AND DISCOVERIES

"I wish I had my pipe," growled Beresford as Forrester sat beside him against the wall of the cavern. "Good cut-bar is wasted on the desiccated old anatomy up above. However! ... Redfern and I, as you know, had gone to Chinese Turkestan for a few months' excavating. You have heard of the sand-buried ruins of Khotan. No? Well, seven or eight hundred miles north-west of us, between the vast Taklamakan desert and the icy Kara-Kash ranges, there is an oasis, stretching some three hundred miles from east to west, known as the oasis of Khotan. You think of an oasis, I daresay, as a verdant, beautiful spot. Khotan is not that. There is verdure: the people grow crops; but a great part of the district is simply dust. During long periods of time the sand of the desert has swept across it, destroying, and yet preserving, cities that were once the flourishing centres of an advanced civilisation....

That smacks rather of the lecture room, I'm afraid. Lecturing is my shop, of course.

"Well, not to bore you, excavations have been going on at Khotan, bringing to light highly artistic objects--vases, frescoes, coins, ivories, and so on--which prove that it was long ago the seat of an Indian Buddhist civilisation. Redfern and I had looked forward to making some interesting finds, but we never dreamed of the one we did actually make. We were poking about in a heap of decomposed rubbish and humus, among fragments of pottery, bones of animals, chips of rotten wood, copper coins and what not, when I suddenly spotted a painted tablet like nothing we had yet come upon. I picked it up, and, sc.r.a.ping away at the accretions of siliceous matter that defaced it--my dear fellow, the mere thought of it sets me all of a jigget even now--under that layer, I say, I found a strip of paper about eight inches by three, torn at one corner, and covered with a few lines of writing in what we call cursive Central-Asian Brahmi.

"It was a beautiful specimen at least twelve hundred years old, and valuable enough on that account; but when I came to decipher it--if one can jump out of one's skin, I nearly did so. It was a letter, apparently from father to son, a sort of death-bed farewell, and it gave detailed directions for a journey to the far side of the Himalayas--that is to say, the southern side--to a spot where lead was trans.m.u.ted into gold! Redfern pooh-poohed it, chanted 'Rowley, Powley, gammon and spinach' like a schoolboy, and when I ventured to suggest there might be something in it, was so rude that I reminded him of what I should have done twenty years ago if my f.a.g had cheeked me. However, I was very patient, and after much persuasion I got him to agree to make a start for the place on the off chance that the story was something more than a fable.

"We set off with a miscellaneous crew of Turki natives, following the very explicit directions of the paper. But the country was so extraordinarily difficult, and the hardships of travel so great, that our escort deserted one after another. We replaced them where we could with fellows picked up en route, Tibetans most of them; but these too, when it came to crossing the pa.s.ses of the Himalayas, funked it, and ultimately we were left with a single follower, a Tibetan, a regular brick of a fellow.

"I won't tell you what we went through; after all, we couldn't expect a walk over! Unluckily, the paper was torn at the corner, as I said, and I believe the missing portion described the exact locality of the spot we were making for. Without it we were at a loss, and wandered a few miles farther south than we ought to have done, until we fell in with some little forest people who told us about a mysterious region beyond a gigantic waterfall, which they were afraid to approach because of the Eye. That seemed promising! We made tracks for the fall, just as you did; we found the rift, marched up it, saw the canoes, and flattered ourselves that we should before long be in a position to verify or disprove the ancient legend.

"I led the way; our Tibetan came next; Redfern brought up the rear. We kept a good look-out, of course; but had no suspicion of danger until I heard the clang of the shutter behind me. They had dropped it a minute too soon. The Tibetan and I were shut in; Redfern was shut out; they hadn't seen him, fifty yards or so behind, round the bend. What followed was pretty much as you described your own experiences. I had just time to fire off my revolver in a way that Redfern would understand as a warning, before the gas overcame me. My Tibetan was already unconscious: I never saw him again.