it back in his pocket. "We should keep
our eyes open when we are on shore. There are two or three landmarks
that ought to help us find the cave without much difficulty if this is
the place."

"There cannot be many caves," concluded the professor, "with entrances
high above the ground as this one is described to be."

The following morning, the day being Sunday, was spent quietly
on shipboard. It had been the custom of the professor since the
commencement of the voyage to have such observances of the day as
seemed fitting. There was a service which he himself conducted at
eleven o'clock. Thereafter, all who wished were this day allowed to
go on shore.

Of the Frontier Boys, Jim and Juarez early in the afternoon availed
themselves of the privilege. Juarez was the only one, however, to wander
away from the landing beach. Jim spent some time readjusting and oiling
his own and his brother's guns, which he had brought with him. Jo and
Tom had said that they, with Berwick, would join him later in the
afternoon.

CHAPTER XX.

AN ADVENTURE.

Juarez had intended on going a short distance, but the bright sunlight,
the charm of the hills, the luxuriant foliage, the unusual and brilliant
wild flowers, all these attractions, coupled with his own exuberant
spirits lured him on.

He reached by a roundabout route the top of the mountainous elevation
which, in company with his comrade, he had explored the day before.

Willing to rest now in the shade of some bushes he lolled upon the
ground, and lulled by the whispering melodies of the trees was about to
drop off to sleep.

Suddenly his attention was attracted to some motion in the underbrush at
a point a third of the way down the mountain. He watched intently and
knew that some person, two, probably, were ascending the slope. In his
efforts to secure a better viewpoint, he stretched far forward, too far,
it turned out, and catching wildly and ineffectively for a support,
greatly to his astonishment, he slipped and fell to a ledge below. The
distance was not great, but his head in the descent came in contact with
a projecting rock, and although he landed upon a growth of thickly
foliaged bushes, he was rendered unconscious by the blow he had
sustained.

He was aroused some time later by voices near at hand, one of which he
immediately recognized. It was the steward of the Storm King who was
speaking.

"I sent you the chart in the keg, but I have learned that the