Like all countries, that portion of empire is ravaged at times by fierce hurricanes and cyclones, which might have uprooted scores of trees and flung them into the waters which were now bearing them toward the Amazon and the broad Atlantic.
The sentinel naturally gave his chief attention to the other side of the Xingu, where so many stirring scenes had taken place that afternoon and evening.

The camp-fire, which had been left burning, had smouldered so low that none of the embers were discernible, and only a thin column of smoke crept slowly upward marking where it had been.
But this vapor was so clearly seen in the wonderful moonlight that it was easy to fix the precise point where the trail entered the wilderness.
It was just there, as Long believed, that the savages would debouch into sight, and renew the warfare which thus far had been only one series of disasters to them.
He was not mistaken, when, shortly after he had noticed the increasing number of logs and driftwood, he fancied he detected something going on at the very point on which his gaze was fixed.
As was the case with Fred Ashman, it was some time before he could so much as conjecture its nature.

The glimpses were so faint and momentary that nothing tangible resulted, though he was positive that some of their enemies were there.
At the moment he uttered an exclamation of impatience, he made out three figures of the natives, who advanced far enough from the wood for him to identify them.
Not only that, but they walked stealthily to the edge of the river and stood several minutes, as if looking across at the canoe.
Long was confident that he could drop one of them at least, and he was tempted to do so.

The most effective way of keeping the savages off was by nipping their schemes in the bud, and filling them with additional terror of the white strangers.
But he decided to wait a while, suspecting, as he did, that some scheme whose nature he could not guess was under way, and that if the projectors were undisturbed, it would soon be revealed.
Jared Long, we say, was convinced that the natives were scrutinizing the canoe and seeking to learn something about the occupants, whom they had doubtless watched as they made their way from the water to the shelter of the wood.

Such was his belief, and yet he was altogether mistaken.
It struck him as odd that the savages acted as they did, when it would seem that they could see just as well from the edge of the wood, where they were not exposed to the fire of their enemies; but he reflected that there was precious little about the conduct of the natives from the first that could be explained on the line of common sense and consistency.
The trio stood in view less than five minutes, when they darted back to cover, as if afraid of being seen by the whites, a theory altogether untenable under the circumstances.
The natural supposition of the sentinel was that a large number of the savages had gathered under the bank and were making ready for some demonstration, which would soon take place.
It was not yet time to awaken the Professor and the natives.