far away, only a faint rumbling of thunder being heard.
"I'm wondering what happened to the phantom," said Tom, after a pause. "Seems to me he was right in that track of the storm."
"Do you think it was a 'he'?" asked Mr. Jenks.
"I think we'll find that it's some sort of a man," answered the young inventor. "We may find out very soon, now. I've changed my theory about the ghost being reflections of light."
"How's that?" Mr. Damon wanted to know.
"Well, I think we are on the side of Phantom Mountain where the diamond cave is," went on the lad. "The fact that the phantom appeared here, soon after we arrived, shows that the men kept close track of our movements. It also shows, I think, that the phantom did not have to travel far to be on the spot, whereas we had to make quite a trip to get around the base of the mountain. I think the cave is up there," and Tom pointed toward the spot where the weird figure had been last seen, before the storm drove it back.
"There may be two phantoms," suggested Mr. Jenks. "They may keep one on this side
