bserved.
With powerful glasses they examined the mountainous country, looking for
the little settlement of Indian Ridge.

"There it is!" exclaimed Mr. Jenks, just as dusk was settling down. "I
can make out the hotel I stopped at. Now we can really begin our search.
The next thing is to find the stone head, and then, I think, I will have
my bearings."

"We'll begin the hunt for that landmark in the morning," said Tom.

High in the air hovered the Red Cloud. At that distance above the earth
she must have looked like some great bird, and the adventurers thought
it unlikely that any one in the vicinity of Leadville would observe
them.

The quest for the great mountain peak, that looked like a stone head,
was under way. Back and forth sailed the airship. Sometimes she was
enveloped in fog, and no sight could be had of the earth below. At
other times there were rain storms, which likewise prevented a view. Mr.
Parker was on the lookout for his predicted mountain landslide, but it
did not occur, and he was much disappointed.

"It's queer I can't pick out that landmark," said Mr. Jenks after two
days of weary searching, when their eyes were strained from long peering
through telescopes. "I'm sure it was around Indian Ridge, yet we've
covered almost all the ground in this neighborhood, and I haven't had a
glimpse of it."

"Perhaps it was destroyed in a landslide, or some cataclysm of nature,"
suggested Mr. Parker. "That is very possible."

"If that's the case we're going to have a hard time to locate the cave
of the diamond makers," answered Mr. Jenks, "but I hope it isn't so."

They continued the search for another day, and then Tom, as they sat
in the comfortable cabin of the airship that night, hovering almost
motionless (for the motor had been shut down) made a proposition.

"Why not descend in some secluded place," he suggested, "and wander
around on foot, making inquiries of the miners. They may know where the
stone head is, or they may even know about Phantom Mountain."

"Good idea," spoke Mr. Jenks. "We'll do it."

Accordingly, the next morning, the Red Cloud was lowered in a good but
lonely landing place, and securely moored. It was in a valley, well
screened from observation, and the craft was not likely to be seen,
but, to guard against any damage being done to it by passing hunters or
miners, Mr. Parker and Mr. Damon agreed to remain on guard in it, while
Tom and Mr. Jenks spent a day or two traveling ar