Clutching their great broad-headed war-spears the next moment the
savages slipped into the forest in the direction the Arab and his
band had gone. Steadily they advanced with the quiet stealthy tread
of panthers on the track of their prey.
CHAPTER XIII
GORILLAS--AND AN AERIAL TOW-LINE
The mystery of the man on the hill bade fair to be an unsolved one,
for although the boys watched for some time with considerable
anxiety he did not reappear. This feature of the incident set them
to comparing notes and they found that their impression of the
apparition differed considerably. Both Frank and Harry were ready
to swear that he was a black man, while Ben Stubbs was equally
convinced that his skin was of a reddish hue. All three, however,
agreed that he was weaponless so far as could be seen, and his
attitude appeared to be more one of interested curiosity than of
actual hostility.
"Well, there's no use wasting time in speculation," said Frank at
last, "more especially as it does not look as if we can get any
nearer to solving the problem in that way. The thing to do now is
to get at the ivory and that as quickly as possible. If that man is
the forerunner of a band that means to attack us, it is all the more
reason that we should get a move on.
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