joined him presently on deck.

"That's good," replied Andy. "And as it is now one o'clock, with no
trouble doing, looks good to me that we'll pull through the night
without a mess."

"You never can tell," observed the careful Frank. "And the only way to
do is to act just as if you felt positive something was bound to crop
up."

"I know it," came the reply, as Andy started to walk up and down a bit,
so as to get the last remnant of drowsiness out of his system.

For an hour he found little trouble in keeping awake. He made frequent
trips to where Felipe stood at his wheel, his keen eyes keeping constant
vigil ahead, in order that he might steer clear of such snags as
threatened to stove a hole in the hull of the steam yacht.

Now and then Andy could see one of the crew moving about; but as some of
them must have duties to perform, even in the night, he did not look
upon this as a suspicious circumstance. Only, he made sure that no one
wandered in the near vicinity of the locked lazerette, where the
precious monoplane lay, securely crated.

In some places the river proved much narrower than in others. And, of
course, it was here they had their greatest trouble. The current was
increased, for one thing. Then the floating objects swept forward with
more speed, so that it required additional dexterity in order to avoid
them.