But a lengthy search of the vicinity failed to show anything except that the professor had vanished as if the earth had swallowed him.
CHAPTER IV.
"WHERE IS HE?"
"Professor!" hailed Dick, at the top of his lungs.
"Professor!" bawled the farm hands.
The red-faced farmer himself regarded the boys quizzically.
"What sort of a chap is this professor of yours?" he asked with an odd intonation.
"He's a geologist," replied Dick. "Why?"