ssed that which was pointed out unseen, for
the impressions in the dust were very faint to them, but plain enough to
the experienced hunter, who advanced cautiously now to the opening into
the cell opposite which they were now standing, and looking in, pointed
out fresh footprints and, what was more, an opening at the back of the
cell which, save in position, proved to be a way into just such a square
cell-like place as that which had puzzled them on their own side.

"No one here," said Griggs, "but it's not long since there was."

"Are you going on at once?" said the doctor.

"Oh yes; let's know the worst, or the best," replied Griggs; "but one
seems to know all there is to know, and it's what we wanted. Here's the
way up to the next range of cells, and when we get up there we shall
find the enemy's trail, and that will lead right up to the cliff,
without a doubt."

"Yes, there's proof enough that if the enemy had been enterprising and
gifted with brains they could have easily found their way down into the
valley by a fresh way."

"Let's go on, sir," said Griggs. "They've never been lower than this;
that's evident. We're the first who have come up that lower way, and it
seems to me, Chris, that we've learned all we wanted. That was to find
a way to the top that a fellow could get up in a hurry. Yes--look here.
It's all clear enough; and once he's got up he's got nothing to do but
break away a step or two, and no one can follow."

Griggs was quite right. Just as it was on the other side of the valley,
the square pit could be ascended by means of projecting stones, and upon
these being scaled the party stood upon the flint terrace and in its
range of cells, beyond which there was a step-like path going up a
narrow rift, leading right to the level tableland.

They all ascended, and taking care not to expose themselves, were able
to sweep the great level for miles, but without seeing the slightest
sign of an enemy.

"It's all right, sir," said Griggs, as soon as they had finished their
inspection. "Here's what we want to carry out young Chris's plan."

"Well, it does make it possible," said the doctor thoughtfully, "but
very risky for the man who is hunted by the enemy."

"Oh dear no, sir. It only wants a man to be pretty smart. I don't see
much difficulty in it."

"No, father," said Chris; "I feel sure that I could do it."

"Nay, don't want everything, youngster," cried Griggs merrily; "let some
one