"No wonder; we've never been anywhere except in spots like this, and it is certain animals wouldn't last long in such places," replied Alfred.
"We might help Frisky out a little," said Ralph, as he grasped a stick, and began to rake out the earth.
While they were at work Alfred was lying with his back against a low mound. He happened to turn around and noticed that the upper part of the elevation was smooth, and contained certain marks and inscriptions.
"What's this?" shouted Alfred, as he arose and gazed down on it.
Ralph, somewhat startled, sprang out of the hollow and drew himself up.
"What have you got?" he asked.
"Here is a mark of some kind; now what can it be?" said Alfred, pointing down to the stone.
"That is singular," remarked Ralph. "A cross, a circle, two arrows, and a set of figures. I suppose it means something, and is there for some purpose."
