has done it," answered Anderson
Rover. "Many a man's head is turned because of gold."

Those on the shore watched the steam yacht round the eastern point of
the isle. Each heart sank as the vessel disappeared from view.

"Well, we can do nothing at present, but hope for the best," observed
the captain. "We cannot think of chasing them in the rowboats."

"We might tramp across the isle and see where they go to," suggested
Tom. "The _Josephine_ must be over there somewhere."

"Yes, we can do that," answered Mr. Rover. "But it will be a rough
journey."

"I have a better idea," came from Dick. "Father has his spyglass with
him. Why not ascend that hill back of where the treasure cave is and
then get up in the highest tree there? A fellow ought to be able to
see all around from that height."

"Hurrah! just the thing!" exclaimed Sam. He did not relish the long
tramp through the thorn bushes and tangle of vines.

Dick's idea was acceptable to all, and they set off without further
delay. They took the path leading to the shattered cave, and then
mounted the small hill Dick had mentioned. Close to the top stood a
large tree.

"Let me go up!" exclaimed Tom, who could climb like a cat, and he
started without delay.

"Look out that you don't break your neck!" cried his parent.

"I'll be careful," answered the fun-loving youth. "This just suits
me!" he added, enthusiastically.

"Can't I go, too?" asked Sam.

"If you are careful," answered Mr. Rover, and up went the lad, right
on the heels of his brother. It was rather difficult work getting from
limb to limb, for some were wide apart, but the vines, which used the
tree as a trellis, aided them greatly. Soon Tom was close to the top
and Sam speedily joined him. Then each took his turn at looking
through the spyglass.

"I see the _Rainbow_!" cried Tom. "She is headed for the north side of
the isle."

"Yes, and yonder is another vessel," returned Sam, as he pointed the
glass in the direction. "That must be the _Josephine_." And then the two
youths shouted the news to those below.

After that the boys watched the progress of the steam yacht with
interest, keeping those below informed of all that was going on. They
saw the _Rainbow_ draw closer to the other vessel, and saw the small
boat leave the steam yacht.

"Four men are rowing to the other vessel," announced Tom. "We can't
make out who they are."

They saw the four men board the other vessel and disappear, pre