By this time we had firmly fixed the perpendicular stick in between the
two large stones; and Tom bent down and peered along the horizontal one.
For fully a quarter of an hour he was alternately raising and depressing
it, until at last, with a sigh of satisfaction, he fixed the prop into
the angle, and stood up. "Look along, Jack," he said. "You have as
straight an eye to take a sight as any man I know of."

I looked along. There beyond the farther sight was the ruddy,
scintillating speck, apparently at the end of the stick itself, so
accurately had it been adjusted.

"And now, my boy," said Tom, "let's have some supper and a sleep.
There's nothing more to be done to-night; but we'll need all our wits
and strength to-morrow. Get some sticks and kindle a fire here, and then
we'll be able to keep an eye on our signal-post, and see that nothing
happens to it during the night."

Well, sir, we kindled a fire, and had supper with the Sasassa demon's
eye rolling and glowing in front of us the whole night through. Not
always in the same place, though; for after supper, when I glanced along
the sights to have another look at it, it was nowhere to be seen. The
information did not, however, seem to disturb Tom in any way. He merely
remarked, "It's the moon, not the thing, that has shifted;" and coiling
himself up, went to sleep.

By early dawn we were both up, and gazing along our pointer at the
cliff; but we could make out nothing save the one dead, monotonous,
slaty surface, rougher perhaps at the part we were examining than
elsewhere, but otherwise presenting nothing remarkable.