Once more the Professor decided to try strategy and see if he could not come up behind his opponent.
At the same moment the visitor apparently decided to resort to the same tactics. They went in opposite directions, however, to carry out their purpose, and when each arrived at the place it was to find that the other was opposite him again.
The Professor's bare feet were in a sad state by this time, his pajamas were torn and his hands were worn tender from using them for feet when running along on all fours. At the same time his temper was wearing to a point of dangerous thinness. It was likely to break down the slender barrier that held it at almost any time.
Suddenly he realized that the intruder had been silent for some minutes, and the Professor decided that it was time he ceased thinking over his own troubles and paid more attention to what the other man was doing.
"Now, I wonder what he is up to," growled the scientist. "I believe he has given me the slip and gotten away. Here I've been dreaming for minutes. I'll slip some myself and see if I can't surprise him if he's there yet."
Once again he started across the camp ground, without resorting to any of his former tactics, other than to proceed with extreme caution, covering the intervening space with long, careful strides.
Reaching the rock, he paused to listen, but could hear nothing.
Gun ready for instant use, Professor Zepplin dashed around the corner of the rock, running plump into the arms of the fellow whom he had been so successfully dodging for the past twenty minutes.
So startled was the scientist that he dropped his revolver, throwing both arms about his antagonist. He was surprised at the slenderness of the fellow, though he quickly discovered that what the other lacked in bulk he easily made up for by his lithe, supple body and muscular arms.
Almost before Professor Zepplin had collected his wits sufficiently to make any sort of defense he found himself lying flat on his back, with his opponent sitting on top of him, both wrists pinioned to the ground in an iron grip.