"But maybe things will look better to-morrow," suggested Nort, as they turned in for the night, having discovered nothing alarming in the direction where Pocut Pete had shot.

"Maybe," half-heartedly assented Bud.

But there was no water coming through the reservoir end of the tunnel pipe when the sun shone again, and, after breakfast, the boy ranchers prepared to explore the dark cave-like opening which extended under the mountain.

"I hope we can turn it on," said Bud, and he looked at the concrete basin of water, trying to calculate how much longer it would last if the supply were not replenished. Already it was lower than it had been the night before, for the cattle had drunk freely during the darkness.

Lanterns were gotten ready, a supply of grub packed, weapons were looked to (for who knew what beast might not lurk in the tunnel?) and at last the boy ranchers were ready to start.

"Good luck!" wished Yellin' Kid as the little party started for the mouth of the tunnel.

"Thanks," chorused Nort, Dick and Bud.

Then they entered the black opening.

If you will imagine a hillside, with a hole, or tunnel, about ten feet high and as broad, but of irregular shape, opening into it, and on the bottom, or floor, a two-foot iron pipe out of which, at normal times, ran a stream of water, you will have a good idea of the place into which our young heroes were to enter.

The tunnel extended all the way through Snake Mountain, curving this way and that, as a brook curves its way through a meadow. In fact the tunnel had been made, centuries ago, by a stream forcing its way through the soft parts of the mountain, and it was this old, hidden, underground stream-way of which Mr. Merkel had taken advantage to bring water to Flume Valley.