"Help! help!"

Why he uttered the cry Bob could scarcely tell.

He did not imagine that any human beings were within sound of his voice.

Yet it is natural for a person in mortal peril to cry for assistance.

Luckily his cries were heard.

Captain Sumner was returning from the Dart, having hastily summoned
Bok, Leeks, and the others.

Glancing in the direction, he saw the polar bear and then Bob.

He did not stop to think, but, taking hasty aim, fired.

Bok also discharged his weapon, and, hit twice in the neck, the beast staggered back.

Bob now saw his friends, and, running up the stream, joined them.

With so many against him the bear tried to flee, but a second bullet from the captain's gun finished him.

"Oh, how thankful I am that you have come," cried Bob gratefully. "I thought I was a goner."

"Don't waste time here," exclaimed Captain Sumner. "These shots will alarm those people we left at the ice cave."

"That is true," said Bob. "Come on—we must rescue my father!"

And he led the way, with the captain at his side.

It was a rough journey up the side of the hill again, and more than once they had to stop to catch their breath.

At the top a surprise awaited them.

The band of strange people had disappeared!

At first Bob could scarcely believe his eyes.

"Where are they?"

"Gone!"

"But to where? I can't see them anywhere."

Captain Sumner shook his head.

A telescope was brought into play, but it did no good.

Captors and captive had alike gone, no one could tell where.

A consultation was held, and it was decided to explore the cave before going back to the Dart.

The descent into the cold spot was not easy, and more than once a member of the party was in danger of breaking a leg.

The bottom reached they made their way to the place where the men had been at work with their axes.

They had cut out a square hole two by three feet and six feet deep.

Gazing down into the bottom of the hole, Bob gave a shout:

"The stone chest, as sure as I live!"

"What!" cried the captain.

He too looked into the opening.

There rested what at first looked to the a square stone of a whitish-blue color.

But a closer examination proved that it was really a stone chest, having two immense hinges of iron. How had the object come there?

"I believe those people were going to dig it out when our firing frightened them off," said Captain Sumner.

"Let us see what the chest contains," returned Bob, in high curiosity.

The others were willing, and by the united efforts of the sailors the top of the chest was pried back.

A murmur of astonishment went up.

The chest contained three iron pots, one filled with silver and the others filled with gold!

"The treasure, sure enough!" ejaculated Jack, who had come along with the sailors.

"There are thousands of dollars there!" said Captain Sumner.

"We ought to take the stuff on board of the Dart," put in Bok. "'Taint no use to leave it out here."

The others agreed with him.

In the chest were two fur-covered sacks, and these the p............