Ab blinked his eyes and, for the first time since Billie had
become acquainted with him, made a noise in his throat, much like
the voice of a child.
Billie smiled in spite of himself.
"I'm glad you've decided to become sociable," he said, "What do
you make of this? You look as though you could think."
Ab blinked his eyes stupidly and then suddenly became alert as
though listening.
"What is it?" asked Billie, impressed by the ape's attitude.
For a reply Ab sprang through the window and made straight for
the structure in the middle of the quarry. In another instant he
was on the roof.
Billie followed as fast as he could and as he stepped beneath the
roof started back in the utmost amazement, for up through what
looked like a huge well there came the distinct sound of human
voices.
For several seconds he stood as one in a spell and then he
started forward to peer into the well, but on a second thought
did not.
"I couldn't see anything if I did," he thought, "but any one
looking up could see me. I'll do better by listening."
The words came to him almost as distinctly as though he were in
the same room with the speakers, and there was no longer any
doubt that the voices were those of the Zapatistas who had
attempted to rob the train.
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