Jack waited for him to reappear, ready to fire, but unwilling to do so until the truth was established.
While waiting thus, a low, faint, tremulous whistle reached his ears.

It was the most welcome of all sounds, and raised him from the depths of woe to blissful happiness, for it was the familiar signal of Fred Greenwood that had been employed many times in their hunting excursions nearer home.
Instead of an enemy, it was his chum and dearest friend who was approaching him.

Jack instantly answered the guarded hail, and the next minute the two came together.
"How is it you are awake ?" was the first question of Jack.
"Because it is _time_ for me to awake; it was agreed that I should go on duty at a little after twelve, and it must be near one o'clock." "But what awoke you ?" "Nonsense! Haven't you and I travelled together long enough to know that when you go to sleep with your mind fixed on a certain time to awake you are sure not to miss it by more than a few minutes ?" "You are right; I had forgotten that.

How was it you knew where to look for me ?" "I didn't.

I've been prowling around camp for fifteen minutes, groping here and there and signaling to you, without the first inkling of where you were.