I was still staring at the monster power plant below us when Dr. Gresham announced:
"I know now that my theory of the earthquakes' origin was correct, and if we get back to the Albatross the defeat of the sorcerers' plans is assured."
"Tell me one thing more," I put in. "Why did the Chinamen come so far from their own country to establish their plant?"
"Because," the doctor replied, "this place was so hidden—yet so easy to reach. And the further they came from their own country to apply their electric impulses to the earth, the less danger their native land would run."
"Still, for my part, the main point of the whole problem remains unsolved," I asserted. "How do the sorcerers use this electricity to shake the world?"
"That," replied the scientist, "requires too long an explanation for the present moment. On the way back to the ship I will tell you the whole thing. But now I must get a closer view of Kwo-Sung-tao's strange workshop."
As Dr. Gresham was speaking, some unexplained feeling of uneasiness—perhaps some faint sound that had registered itself upon my subconscious thoughts without my ears being aware of it—led my gaze to wander over the mountainside in our vicinity. As my eyes rested for a moment upon some rocks about a hundred yards away, I fancied I saw something stir at the side of them.
At this moment Dr Gresham made a move to leave the promontory. Laying a detaining hand swiftly upon his arm, I whispered:
"Wait! Stand still!"
Unquestioningly the astronomer obeyed; and for a couple of minutes I watched the neighboring clump of rocks out of the corner of my eye. Presently I saw a darkly-clad figure crawl out of the shadow of the pile, cross a patch of moonlight, and join two other figures at the edge of the timber. The trio stood looking in our direction a moment, while apparently holding a whispered conference. Then all three disappeared into the shadow of the woods.
Immediately I announced to my companion:
"We have been discovered! There are three Chinamen watching us from the timber, not a hundred yards away!"
The scientist was silent a moment. Then:
"Do they know you saw them?" he asked.
"I think not," I replied.
Still without looking around, he asked:
"Where are they—directly behind us?"
"No; well to the side—the side nearest the power plant."
"Good! Then we'll move back toward the timber at once—go leisurely, as if we suspected nothing. If we reach the cover of the woods all right, we'll make a dash for it. Head straight up for the top of the ridge—cross over and descend into the gulch on the other side—then detour back toward the Albatross. Stick to the shadows—travel as fast as we can—and try to throw off pursuit!"
Moving off as unconsciously as if we were totally unaware that we had been observed, we struck out for the timber—all the time keeping a sharp lookout, for we half expected the spies to head us off and attempt a surprise attack. But we reached the darkness of the woods without even a glimpse of the Celestials; and instantly we broke into a run.
The ascent was too steep to permit much speed; moreover, the roughness of the ground and the fallen timber hampered us greatly—yet we had the consolation of knowing that it equally hampered our pursuers.
For nearly an hour we pressed on. The mountaintop was crossed, and we descended into a canyon on the other side. No sight or sound of the Chinamen had greeted us. Could they have surmised the course we would take, and calmly let us proceed, while they returned for reinforcements to head us off? Or were they silently stalking us to find out who we were and whence we came? We could not tell. And there was the other chance, too, that we had shaken off pursuit.
Gradually this latter possibility became a definite hope, which grew as our overtaxed strength began to fail. Nevertheless, we pushed on until we were so spent and winded that we could scarcely drag one foot after the other.
We had now reached a spot where the floor of the canyon widened out into a tiny level park. Here the timber was so dense that we were swallowed up in almost complete darkness; and in this protecting mantle of shadow we decided to stop for a brief rest. Stretching out upon the ground, with our arms extended at our sides, we lay silent, inhaling deep breaths of the cool, refreshing mountain air.
We were now on the opposite side of a long and high mountain ridge from the Chinese village, and, as nearly as we could estimate, not more than a mile or two from the Albatross.
Lying there on the ground, we could feel the earthquakes with startling violence. We noticed that they no longer occurred only at intervals of eleven minutes and a fraction—although they were particularly severe at those periods—but that they kept up an almost continuous quivering, as if the globe's internal forces were bubbling restlessly.
Suddenly, in the wake of one of the heavier shocks of the eleven-minute period, the intense stillness was broken by a sharp report, followed by a ripping sound from the bowels of the earth, that seemed to start close at hand and rush off into the distance, quickly dying out. From the mountainside above us came the crash of a falling tree and the clatter of a few dislodged rocks bounding down the slope. The earth swayed as if a giant gash had opened and closed within a few rods of us.
The occurrence made Dr. Gresham and me sit up instantly. Nothing, however, was visible through the forest gloom of any changes in the landscape. Again silence settled about us.
Several minutes passed.
Then abruptly, from a short distance away, came the sound of something stirring. Sitting motionless, alert, we listened. Almost immediately we heard it again, and this time the sound did not die out. Something off there in the timber was moving stealthily toward us!
Dropping back at full length upon the ground, with only our heads raised, we kept a sharp watch.
Only a few more moments were we kept in suspense; then, across a slit of moonlight, we saw five Chinamen swiftly moving. They were slinking along almost noiselessly, as if following a scent—and, with a shock, we realized that it was ourselves they were tracking! We had not shaken off our pursuers, after all!
Even before we could decide, in a whispered debate, what our next move should be, our nerves again were whipped taut by other sounds close at hand—but now on the opposite side of the little valley from the first ones. This time the sounds grew fainter—only to become louder again almost immediately, as if the intruders were searching back and forth across the flat. In a short while it became plain that they were drawing closer to us.
"What fools we were to stop to rest!" the astronomer complained.
"I have a hunch we would have run into some of those spies if we had kept on," I rejoined. "They must have headed us off and found that we didn't pass on down this canyon, else they
