"Duck!" gasped Dave Darrin, seizing Dick by one arm. "He means
big mischief!"

What it was for which he had reached in his pocket neither Grammar
School boy saw, for both turned at the same instant, beating a
swift retreat. Sixty feet away, however, they halted, wheeling
about.

Garwood, seeing the boys run, acted as though he would give them
no further thought. He was already walking in the opposite direction,
his back turned to them.

"Ugh! He gives me cold chills," cried Darrin.

"He does the same to me," sighed Dick, "but it's a plain case
of duty to follow him until we can turn him over to those who'll
take good care of the poor fellow."

Just as Amos Garwood was on the point of vanishing from their
view, the two schoolboys started forward, more cautiously than
before.

Back of them in the woods, far away, sounded a boyish war-whoop.

"Hi-yi-yi-yi-_yoop_!" answered Dave Darrin.

Amos Garwood started forward with a bound like that of a deer.
Then his long legs went into rapid operation. Prescott and Darrin
ran onward as fast as they could go. They were trained to running,