Walter Perkins nodded as he picked up the belongings of his chum.

"Mr. Nance," said Tad, "I think you and Ned are the strongest, so I'll
ask you two to take hold of the rope when I get started. If you need
help the Professor will lend a hand."

Professor Zepplin shook his head. He did not approve of this at all.
However, it seemed their only hope. Tad started for the lower end of
the walled-in enclosure, the others following him. The lad made the
rope fast around his waist, twisting it about so that the knot was on
the small of his back. Thus the rope would not interfere with his
swimming. He then uncoiled the rope, stretching it along the ground to
make sure that there were no kinks in it.

"There, everything appears to be in working order. Don't you envy me
my fine swim, boys?" Tad laughed cheerfully.

"Yes, we do," chorused the boys.

It must not be thought that Tad Butler did not fully realize the peril
into which he was so willingly going. He knew there was a big chance
against his ever making his goal, but he was willing to take the slender
remaining chance that he might make it.

"All ready," he said coolly.

Dad and Ned took hold of the rope.

"Don't hold on to it at all unless I shout to you to do so. I must be
left free. Let me be the judge if I am to be hauled back or not."