Then, once more, came a terrific clap! A great mass of fire, like some red-hot ingot from a foundry, was hurled through the air, straight at the face of the mountain, and at the spot where the figure in white had stood but a few minutes before.
Instantly the earth trembled, as it had at Earthquake Island, but it was not the same. It was over in a few seconds. Then, as the diamond seekers looked, they saw in the glare of a score of lightning flashes that followed the one great clap, the whole side of the mountain slip away, and go crashing into the valley below.
“A landslide!” cried Mr. Parker. “That is the landslide which I predicted! The lightning bolt has split Phantom Mountain!”
CHAPTER XVI—THE VAST CAVERN
For a time the roiling, slipping, sliding and tumbling of the mass of earth and stones, down the side of the mountain, effectually drowned all other sounds. Even the thunder was stilled, and though Tom and his companions called to one another in terror, their voices could not rise above that terrific tumult.
Finally, when they found that the direction of the slide was away from their tent, and that they were not likely to be engulfed, they grew more calm.
Gradually the noise subsided. The great boulders had rolled to the bottom of the valley, and now only a mass of earth and stones was sliding down. Even this stopped in about five minutes, and, as though satisfied with what it had done, the electrical storm passed. Not a drop of rain had fallen.
“Bless my shirt studs!” exclaimed Mr. Damon, who was the first to speak after the din had quieted. “Bless my soul! But that was awful!”
“It was just what I expected,” said Mr. Parker, calmly. “I knew, from my observations, that we were in a region where landslides and terrific electrical storms may be expected at any time. I fully looked for this.”