"She's found the treasure!" whispered Enid. "You can hear the happiness in her voice."
But the girls were mistaken. The group had searched high and low but nothing was in sight. The professor had found a bit of old ruin, part of a wall that he claimed was Indian fortification. But that was all. No mounds or signs of a village.
"Why Joy and I found something just as interesting as that," laughed
Enid. "Under the trees here, the wall of that small cliff has the most
peculiar weather markings. Take a look at it, Professor Gillette.
It's interesting."
The professor bent away some of the branches of the trees so as to get a good view of the rock. The girls standing near, heard him give a gasp of astonishment.
"What's the matter now?" asked Bet Baxter.
"Those markings were never made by the weather. They were carved by human hands. And our arrow is pointing straight toward it. I don't understand why we didn't see it before."
"It's the treasure!" exclaimed Bet. "Let's see what's there!"
CHAPTER XV
A SPY
The professor's hand trembled with excitement as he scratched the surface of the rock, tapped the face of the wall for a possible hollow sound, then called on Bet to bring him a pick.