Just then the mines under the water mains went off, ripping the conduits to tatters—and the immense hydraulic force, suddenly released, roared down the precipice, tearing the ground at the bottom of the gorge away to the foundation rock and obliterating the last scrap of wreckage!

Almost at the same moment Dr. Gresham left us and plunged down the slope toward the high priest, as if to settle the score with him alone. Recovering from our surprise, we followed rapidly.

Apparently sensing the danger, Kwo-Sung-tao suddenly glanced around. As he beheld Dr. Gresham he pulled himself together and I saw a look of malignity come over his face such as I never before nor since have seen upon a human countenance! It was as if he sought to blast his enemy with a glance!

The demoniacal fury of that gaze actually caused the astronomer to slacken his rush.

Promptly the old sorcerer’s hand darted beneath his robe and came out with a revolver. But before the weapon could be aimed I had snatched a hand grenade and hurled at the Chinaman. The missile flew over him, exploding some feet away; but a bit of its metal must have hit the old fellow, inflicting a serious wound, for he dropped the revolver and clutched at his side.

As he did so he turned his eyes upon me—and the blood seemed to freeze within my veins! Not to my dying day shall I forget the awful power of that look!

But only for a second did this last—for I had already drawn another grenade and was in the act of hurling it. This time the bomb fell directly at the feet of the high priest and burst with deadly force.

Even while the old man’s eyes were boring through me with that unearthly fury, Kwo-Sung-tao was blown to fragments!

An instant later the sun vanished, and a ghostly semi-night fell like a thunderbolt!