bank, masking the torrent like a white veil.

"Wonderful! wonderful!" exclaimed the Professor, raising both hands
above his head, glancing first up then down the imposing mountain
gash. He was deeply impressed by the spectacle.

"Young gentlemen," he said, turning to them, impressively, "it would
be well for you to give serious thought to the remarkable region in
which you now find yourselves."

"Yes, sir," agreed Tad.

"We are not liable to forget it, Professor," added Ned.

"The Ozark region is unusual in having within such limited areas so
wide a range of geological formation."

Professor Zepplin in his enthusiasm was waxing eloquent, and the lads
were giving respectful attention.

"Perhaps you are unaware," continued the scientist, "that in both the
eastern and western portions of this range, a section running
transversely to its main axis presents a complete succession from the
oldest Archaean to the newest quaternary."

The Professor fixed Stacy with a stern eye.

"Do you follow me, young gentleman?"

"Ye--yes, sir," stammered Chunky weakly, shrinking back against the