t Dave, too, straightened up as he stepped into the cave
proper.

"What's going on in there?" Tom Reade called in through the tunnel.

"Stay where you are," Dalzell called back, "and don't let us get bagged
in here by any one."

Then Dan straightened up on his feet and took several curious looks
about him while Dick flashed the light.

"Say, this is bigger'n a barn in here, only not so high!" gasped Dan.

"I wonder why nobody ever knew of this dandy place before?" mused Dave.
"And the air's good in here, too."

"The air's good enough," Dick assented hurriedly. "But what we came here
for was to see whether we can find Greg. Come on, fellows--be quick."

"This leads to nothing, after all," sighed Dave Darrin at last.

"There may be other parts to the cave that we haven't found yet,"
advanced young Prescott. "Now, halt, everyone! Quiet! Greg?"

Dick's voice echoed in the place. Away off in one corner something
seemed to be stirring.

"What's that?" asked Dick quickly.

"Time to beat it!" muttered Dan. "We've disturbed some animal that lives
here."

"Sh!" ordered Prescott, holding up one hand. "Greg!"

Against their ear-drums came again, rather faintly, the sound of
something moving.

"If you're Greg, you keep on making the noise until I locate you," urged
Dick. "Fellows, you stay right where you are. Don't move."

Once more that sound of something moving came to the boys, and Dick, on
tip-toe, moving softly, ranged toward the direction from which he
believed the noise had come. As Dick moved away from them with the
light, Dave and Dan found themselves in comparative darkness.

"If that's you, Greg, keep on making all the noise you can," directed
young Prescott, as he neared one of the jutting ledges of rock.

A distant snort came as though in answer.

"If that's you, Greg, you can do it again," cried Dick in a low, eager
voice. "If it's you, do it just four times."

Then Dick halted, realizing in the stillness that he could hear his own
heart beating rapidly.

Again came the snort--one, two, three--four times. Then it stopped.

"Dave! Dan!" quivered Dick's voice. "Come running! It's Greg."

There was a sound of running feet--then a thump. Dave Darrin was still
coming, but Dan had tripped over some little obstacle and had fallen
flat.

"Hold on, there, you two!" howled Dan. "I've hurt my knee. Wait until I
reach you."

But Dave and Dick paid no heed. Once more they had heard the snorts, and
ha