Margaret did not openly protest, but to herself she thought: “I’ll never sleep a wink, I know, with that window open, for how easy it would be for the mountain lion to spring in and eat us up before we knew it.”

But after a time, the fragrance of pine boughs lulled the tired girl to sleep, and when Virginia was sure that the slumber was not feigned, she rose very quietly and tiptoed toward the door.

CHAPTER XXIII—NIGHT PROWLERS.

Virginia, sincerely hoping that the eastern girl would not awaken, tiptoed out of the log cabin and very quietly closed the door. She was carrying the unlighted lantern and some matches. Not far from the cabin was a small cave. In this Virginia went and struck a light when she was sure that it would not be seen by anyone outside. Then opening the brown paper, she read again and more carefully what her brother, Malcolm, had written.

The property which he wished observed lay directly below the cave far down in the canyon, but it was not this part of the message which had stirred Virginia to action. It was that which followed.

“Pat Mahoy states that about a week ago while he was prospecting about here, a desert-rat sort of a man took him by surprise. He has feared ever since that the man may have suspected that the property was valuable and that he might return, so don’t sleep until we get back. Keep alert and on the watch.”

Little did Malcolm dream when he wrote that hastily scrawled message that it would be a mere girl and his most dearly loved sister who would assume the truly dangerous position of night watch.

Leaving the lantern in the cave, Virginia went out into the darkness and stood leaning against a boulder where she could not be seen but where she could observe the downward slope of the canyon.

Every half hour she went to the cabin and listened at the open window that she might be assured that Margaret was still sleeping undisturbed.

It was on her return from one of these visits to the cabin that she uttered an exclamation of dismay, for, far down in the canyon, she saw lights moving about.