Just when he went out the boys did not know, but in the middle of the night they were awakened by a cry.
“Boys! Boys! Help! They’ve got me!” was shouted in distressed tones.
“It’s the professor!” exclaimed Jerry, sitting up suddenly.
“That’s what! And he’s in trouble!” added Ned. “We’ve got to help him!”
They arose and rushed from the tent into the darkness only faintly illuminated by the dying blaze of the campfire.
[CHAPTER XXI]
QUEER MARKS
“What is it?”
“What was it?”