It will be recalled that the Professor started in pursuit of the flying native with as much ardor as his friend, but, less skilful than he, he had taken but a step or two, when an obstruction flung him to the ground with discouraging emphasis.

Concluding that he had undertaken a futile task, he hastily climbed to his feet to await the return of Long who, he was satisfied, would attempt only a brief pursuit.

Remembering the javelin which had whizzed so near his crown, he cast about for a moment and picked it up from the earth where it lay but a few feet distant. As he balanced it in his hand, he observed that it was about six feet in length, was made entirely of wood, which was heavy and as hard and smooth as polished ebony.

The light of the moon was like that of the day itself. It would have been easy to read ordinary print by it. He had no trouble, therefore, in closely examining the novel implement of war. As he suspected, the point was made of stone or flint, ground almost to needle-like sharpness and securely fastened in place by a fine tendon wound around the portion of the stick that held the harder part. This was covered with a gummy substance extending to the end.

This he was satisfied was among the most virulent of substances known to toxicology. A puncture of the skin was sure to be fatal unless some remedy, of whose existence he held no suspicion, was instantly obtainable.

He had set down his rifle white examining the weapon, but quickly caught it up again, still retaining the javelin in his right band. He had been startled by the sound of the terrific threshing among the trees on his right.

He supposed that his friend was coming back, but, glancing toward the point where he expected him to appear, he was amazed to see the third native, who whisked off before Long could draw a bead on him, step from the wood not twenty paces away. His back was toward the Professor, and, strangely enough, he did not observe the white man—an oversight that never could have occurred, but for the tumult in the undergrowth which held his attention.

Grimcke had hardly caught sight of him, when the other native came flying to view, so astonishing his waiting comrade that he stood a moment irresolute after the white pursuer burst into sight.

Brief as was this pause, it gave the Professor time for some exceedingly fine work. He uttered a shout which caused the native to turn his affrighted gaze behind him, just in time to observe the white man with javelin raised and apparently in the very act of launching it at him.

The savage knew what a prick from that frightful thing meant, and with a howling shriek he ducked his head as though he had caught its whizz through the air, and shot among the trees with as much celerity as his companion had shown in coming from them.

Neither of the explorers wished to slay the natives, no matter how savage, unless compelled to do so in actual self-defence. Long had recovered from his first burst of fury, and, though the Professor could have sunk the javelin in the naked body, he withheld it, not unwilling that his assailant, now that he had started to flee, should escape.

The one who had so foolishly come back to the river side was left in the worst possible situation, for both his enemies stood between him and the sheltering forest and he was defenceless. He was at their mercy, and such people as those natives neither gave nor expected quarter, when engaged in their savage warfare.

The fellow acted like a bewildered animal. The white strangers were standing a few paces apart, so as to form the two angles of a triangle, while he made the third. The nearest point to the forest way midway between Grimcke and Long, as was apparent to the savage, who was fairly cornered.

Had the Xingu behind him been as placid as farther above or below the rapids, he would not have hesitated to plunge into its waters, trusting to his skill in swimming; but, to dive into the raging current would have been as certain destruction as for a man to undertake to swim unaided through the whirlpool below Niagara.

Grimcke and Long were not unwilling to torment the fellow, because of his cowardly attempt a few minutes before, though, as has been stated, neither intended to do him any special harm.

The affrighted native crouched down, as though seeking to draw himself into such a narrow compass that the terrible javelin could not reach him. Despite the proof he had seen of the power of the civilized weapons, he held his own in greater dread.

Grimcke raised the spear, as if poising it aloft to hurl at the savage. The latter uttered a howl of terror, and, with his head still low, attempted to dart between the strangers. Naturally he shied as far away as possible from the Professor, and thereby brought himself almost close enough to touch Jared.

"That's what I want," muttered the latter, hurriedly concentrating his strength in his good right leg, and delivering the most powerful kick at his command.

It was well aimed and most effectively landed. The Professor was sure he heard the "dull thud," and always insisted that the recipient was lifted clear of the ground and propelled among the trees with an impetus sufficient to break his neck.

"There!" exclaimed the New Englander, looking around, "I guess I'm through!"

"I am sure that last fellow hopes so," said the Professor with a laugh, "for it's safe to conclude he was never handled with such vigor before."

The levity which both felt over their triumphant routing of their assailants was checked by the sight of the stark, lifeless form on the ground, only a few paces distant.

They had the best plea in the world for shooting the fierce savage, but the consciousness that the necessity existed and that the deed had been done, rendered them serious and thoughtful.

There was reason for believing the other natives would watch them from the forest, and the one who retained his javelin was likely to seek the chance to use it again. He certainly had strong temptation to do so, with the prospect of little risk to himself.

Besides, as the explorers followed the rapids, their uproar increased to that extent that the savages could move freely without danger of any noise being overheard.

The most prudent thing to do seemed for the friends to walk so briskly as to disconcert any plan their enemies might have formed. This was quite easy, because of the open space, already mentioned, as lining both banks of the Xingu.

Fortunately the distance to camp was not far, and, with the hurried pace adopted by the Professor and Long, it ought not to occupy more than a few minutes, provided no interruption occurred. Strange emotions tortured both, as they kept their eyes fixed on the dark wood at their side, from which they expected the sweep of the fearful javelin, whose touch was death.

The keenest hearing could not detect the faint whizz, while the roar of the rapids was in their ears, and they had to depend, therefore, on their eyes, which promised to be of little more service.

But the entire distance was almost passed, and the hearts of the two were beating high with increasing hope, when Long, with a gasp of terror, grasped the arm of the Professor with incredible force, and jerking him backward, pointed with his extended finger to the camp in front of them.