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