tly some man dressed up in a sheet," declared Mr. Jenks. "I
expected as much."

"The work of those diamond makers; do you think?" continued Mr. Damon.

"I believe so," answered Tom, slowly, for he was trying to think it out.
"I believe they are the cause of the phantom, though I don't know that
it's a man dressed in a sheet."

"Why isn't it?" demanded Mr. Jenks.

"Because it was too tall for a man, unless he's a giant."

"He may have been on stilts," suggested Mr. Parker.

"No man on stilts could walk along that way," declared Tom, confidently.
"He glided along too easily. I am inclined to think it may be some sort
of a light."

"A light?" queried Mr. Damon.

"Yes, the diamond makers may be hidden in some small cave near here, and
they may have some sort of a magic lantern or a similar arrangement, for
throwing a shadow picture. They could arrange it to move as they liked,
and could cause it to disappear at will. That, I think, is the ghost we
have just seen."

"But the diamond makers have only been in this mountain recently,"
objected Mr. Jenks, "and the phantom was here before them. In fact, that
was what gave the place its name."

"That may be," admitted the lad. "There are many places that have the
name of being haunted, but no one ever sees the ghost. It is always some
one else, who has heard of some one who has seen it. That may have been
the case here. I grant that this place may have been called 'Phantom
Mountain' for a number of years, due to the superstitious tales of
miners. The diamond makers came along, found the conditions just right
for their work, and adopted the ghost, so to speak. As there wasn't any
real spirit they made one, and they use it to scare people away. I think
that's what we've just seen, though I may be wrong in my theory as to
what the phantom is."

"Well, it's gone now, at any rate," said Mr. Jenks, "and I think we'd
better get back inside the tent. It's cold out here."

"Aren't some of us going to stand guard?" demanded Mr. Damon.

"What for?" asked Mr. Jenks.

"Why--er--bless my key-ring! Suppose that ghost takes a notion to come
down here, and use his gun, as he did on the miners?"

"I don't believe that will happen," remarked Tom. "The diamond makers,
if the white thing had anything to do with them, have given us a
warning, and I think they'll at least wait until morning to see how we
heed it."

"We aren't going to heed it!" burst out Mr. Jenks. "I'm going to go