"See, comrades, this is it: The little tree is bent far down and held by the long vine. The vine passes around a low branch, then up over other limbs, and out across the path, where it is fastened to a root near the ground. A man following the path breaks the vine. The little tree then flies up and the bark sheet strikes the wide mouthpiece of the gun. The air forced into that mouthpiece by the blow of the bark shoots the little dart. The dart does not fly as hard as if blown by a man, but it goes swiftly enough to pierce the skin of anything except a tapir. As soon as the poison is in the blood the work is done." "It sure is done," Knowlton echoed, thinking of the short distance covered by the dead Peruvian after passing this spot. "Mighty ingenious apparatus. These people are no fools, I'll say." "You say rightly," Pedro muttered. Turning, they went out to the path, looking askance at the thin death tube as they passed along it. The scouting Mayorunas returned, having found nothing. Tucu resumed his place at the head of the line. Without a backward glance at the body sprawling in the trail at the rear, the column swung into its usual gait. The Americans, silent before, were silent again. They had looked for the first time on the work of the Mayoruna traps; had observed the cold-blooded way in which the Indiana handled the still form on the ground; had visualized the forthcoming mutilation of that body and the resultant cannibal rites. More vividly than ever before they realized that these men and Monitaya himself were relentless creatures of the jungle, and that, despite the present existent friendliness, there yawned between them and their barbarous allies an impassable gulf. For the moment the jungle itself seemed a poisonous green abyss of creeping, crawling, sneaking death. And though they had faced death too often in another land to fear it in any form, though they marched on with unwavering step, their eyes were somber as in their hearts echoed the last appeal of the man they had left behind them: "Ye ain't goin' to desert a comrade amongst a lot o' man eaters--" CHAPTER XIX. THE RED BONES Four days the expedition tramped steadily onward through the rugged labyrinthine hills. Four nights its members slept in utter exhaustion. Neither by day nor by night was any sign of the Raposa seen, nor of any other human being. So tired from the constant struggle did the Americans become that their jaded brains began to picture the mysterious wild man as a mere legendary creature, which they never would find even though they searched the inscrutable forests until the end of time. Yet when, on the fifth day, Tucu informed them that they now were nearing the principal settlement of the Red Bones, the announcement cheered them as if they were about to enter a civilized city and there meet David Rand safe and sane.