LIST OF ILLUSTRATIONS
"Raise him up!" Skip shouted, and in another instant Fred was
suspended over the old shaft [Frontispiece]
Fred set off at full speed, and almost immediately a shout went
up from the rioters: "The sneaks are sending for help! Stop
that boy!" [74]
"You four are to act as sentinels," said the superintendent. "Study
this map and you will hit upon a scheme" [95]
"Please don't drag me off," Skip said, piteously. "I'll never hurt
you or anybody else again" [128]