"It's not the man part of it," interrupted the other. "It's the cry. There, Mukoki has his pack ready. Let's start for the chasm at once!"
This time the boys had a heavier burden than usual, for in the canoe they placed one of the two loads carried by Mukoki, and consequently their progress toward the chasm was much slower than that across the plain. It was late in the afternoon when they reached the break that led into the chasm, and as they cautiously made the descent now Rod thought of the thrilling pursuit of the Woonga horde, and how a few weeks before they had discovered this break just in time for Wabi and him to save their lives, and that of the wounded Mukoki. It was with a feeling almost of awe that the three adventurers penetrated deeper and deeper into the silent gloom of this mystery-filled gulch between the mountains, and when they reached the bottom they set their loads down without speaking, their eyes roving over the black walls of rock, their hearts throbbing a little faster with excitement.
For here, at this break in the mountain, began the romantic trail drawn by men long dead, the trail that led to a treasure of gold.
As the three sat in silence, the gloom in the chasm thickened. The sun had passed beyond the southwestern forests, and through the narrow rift between the mountain walls there fell but the ebbing light of day, dissolving itself into the shadows of dusk as it struggled weakly in the cavernous depths. For a few minutes this swift fading of day into night gripped the adventurers in its spell. What did the lonely solitudes of that chasm hold for them? Where would they lead them? To Rod's mind there came a picture of the silver fox and a thought of his dream, when for a few miles he had explored the mysteries of this strange, sunless world shut in by rock walls. Again he saw the dancing skeletons, heard the rattle of their bones, and watched the wonderful dream-battle that had led him to the birch-bark map. Wabigoon, his eyes gleaming in the gathering darkness, thought of their flight from the outlaw savages, and Mukoki—
The white youth had turned a little to look at the old warrior. Mukoki sat as rigid as a pillar of stone an arm's reach from him. Head erect, arms tense, his eyes gleaming strangely, he stared straight out into the gloom between the chasm walls. Rod shivered. He knew, knew without questioning, that Mukoki was thinking of the cry!
And at that instant there floated up from the black chaos ahead a sound, a sound low and weird, like the moaning of a winter's wind through the pine tops, swelling, advancing, until it ended in a shriek—a shriek that echoed and reëchoed between the chasm walls, dying away in a wail that froze the blood of the three who sat and listened!
CHAPTER XII
WABI MAKES A STRANGE DISCOVERY
Mukoki broke the silence which followed the terrible cry. With a choking sound, as if some unseen hand were clutching at his throat, he slipped from the rock upon which he was sitting and crouched behind it, his rifle gleaming faintly as he leveled it down the chasm. There came the warning click of Wabigoon's gun, and the young Indian hunched himself forward until he was no more than an indistinct shadow in the fast-deepening gloom of night. Only Rod still sat erect. For a moment his heart seemed to stand still. Then something leaped into his brain and spread like fire through his veins, calling him to his feet, trembling with the knowledge of what that cry had told him! It was not a lesson from the wilderness that Roderick Drew was learning now. As fast as the mind could travel he had gone far back into the strife and misery and madness of civilization, and there he found the language of that fearful cry floating up the chasm. He had heard it once, twice—yes, again and again, and the memory of it had burned deep down into his soul. He turned to his companions, trying to speak, but the horror that had first filled Mukoki now fastened itself on him, and his tongue was lifeless.
"A madman!"