"Give it to him, everybody!" suddenly shouted Lieutenant Beverly.

Hardly had he uttered the last word than there was a rattle of firearms as the three of them discharged their weapons. There arose a mighty roar of anger as the bear felt the sudden pain of bullets entering his flesh.

"Again! He's staggering, but full of fight yet!"

Once more the pistol shots rang out. The bear was moving, but seemed to be growing quite weak and confused, for once he fell half over, though managing to recover and push on.

It took several more rounds before the huge bulk rolled over, gave a few spasmodic kicks, and then expired.

"Bully work, boys!" shouted Jack, as he hurried forward to take a close-up view of their victim. "Gee whiz! but isn't he a buster though?

Never did I dream I'd help bring down a real Arctic white bear! And just to think of the queer conditions of this hunt, too, will you? I wager, now, there never was one like it--by airplane at that!"

After one look at the bear Tom returned to his task. Shooting game was all very fine, but he had business of a different character to call for his attention just then.

"Wonder if the old chap has got a mate around?" suggested Jack, a sudden thought causing him to survey the ice-floe as seen under the faint light of the stars that were beginning to show in the heavens above.

"Not one chance in a thousand he had company," Beverly insisted; "but no harm in your keeping a wary eye about, Jack, while Tom gets things in shape again. I have to stay here with the light. If you've a sharp knife what's to hinder you from taking one of his claws for a trophy?"

"I'll do that same. Thank you for reminding me, Colin! Some fellows I know are such Doubting Thomases you have to be in a position to prove everything you tell them. Tom, loan me that knife of yours, please. It's got an edge like a razor to it, and those paws look simply immense."

"Make haste about it, for we'll soon be ready to skip out of this place,"

Tom warned him as he handed over the knife.

Jack began to work industriously. He found he had undertaken no mean job when he contracted to sever one of the front paws of the dead Polar bear.

Not only did he have to cut through ligaments and tough skin, but the bones themselves gave him no end of trouble.

He solved this by finding the heavy monkey-wrench, and using it as a hammer, with the knife in place, thus actually severing the paw complete after considerable trouble.

"There, isn't that a regular beauty to show?" he demanded, holding up the result of his labor. "I feel something like a young Indian warrior who's just killed his first grizzly, and means to hang the claws about his neck to prove his bravery."

He stood looking down at the monster bear for a minute, debating something in his mind.

"I wonder now," Jack finally observed, "if we could eat that bear meat, supposing something happened to keep us marooned on this ice for weeks at a stretch? What do you think about it, Tom?"

"It might be possible, if we got in a bad pinch and were almost starving," came the reply. "But you must remember we'd have to swallow it raw, because we haven't any means for making a fire; and trying to kindle a blaze on the ice would be a tough job."

"Then I'm glad to know we don't have to depend on bear meat to keep us from starving," Jack announced. "Pretty nearly through, Tom?"

"Five minutes more ought to see us ready to start. I'm pretty hungry though and would like something more to eat. You boys ate a good deal, but you called it 'a snack,' and not 'supper.'"

"On the whole," Colin suggested, "perhaps we'd better leave the supper until we get to moving smoothly again. Things ought to taste better if we feel we've got the bulge on this engine trouble for fair."

Jack did not try to urge any undue haste. Nevertheless he looked several times in the quarter close by where the big berg raised its cone, as if his uneasiness now might be wholly concerned with its possibilities for making fresh trouble.

Was it imagination, or some sort of optical delusion that made the tip of the huge berg seem to come lower and lower, then draw back again as if making a ceremonious bow like a dancing-master?

Jack gasped, and opened his lips to cry out, but thinking better of it restrained the temptation. They could not get away until the repairs were complete. At the same time, while trying to make himself believe he had magnified the thing, he was conscious of a louder grinding noise than any heard up to that moment.

Tom was putting the finishing bolt in place. A few more efforts and he would be able to announce that his task had been completed. Jack became conscious of a peculiar undulating movement to the ice under his feet. It was just the same as he could remember experiencing when on skates, and going at full steam over a thin section of ice that must have easily broken under his weight only for the speed with which he crossed over.

Was the ice floe about to break up? Would it result in several smaller sections separating from the main stem, none of which might be of a size to allow them sufficient room for making a start?

The thought alarmed Jack. He also knew that undoubtedly any movement to the pack ice must be caused by some action of the giant berg. Was that mountain of ice about to take the plunge at last, and turn over, its base being eaten away to such an extent that the whole had become top-heavy?

Once again did Jack turn his startled eyes to the left. He could not get it out of his mind how terribly suggestive that "bow" on the part of the berg had been.

There it was, coming again! Perhaps the wind had grown stronger since they dropped down upon the ice, and was adding its force to the action of the waters.

Jack found himself unable to hold in any longer. If such a dreadful peril hung over them it was time his companions knew the need of haste in getting free from that doomed field of ice. So he put all doubts behind him and gave tongue.

"Hurry, hurry, Tom! The iceberg is acting queerly. It's tottering as if ready to roll over on us! Don't you see how it acts, Tom?"

CHAPTER XXII

WHEN THE ICEBERG ROLLED OVER

Fortunately Tom had everything ready for an immediate start, acting under orders, Jack and Beverly having previously changed the position of the big plane, so that it now faced the run taken when landing.

This brought the wind back of them; but that would be an a.s.set rather than a detriment. They had also gone hastily over the course to make absolutely certain there was no break, or other trap, which might give them serious trouble.

"Jump aboard, both of you!" cried Tom, still keeping his head--a lucky thing, since to get "rattled" in such a crisis might prove fatal.

The beating of the engine and the whirr of the propellers announced that they were off. On the comparatively smooth ice it was easy to make a start una.s.sisted by mechanics or hostlers.

Jack's heart seemed to be in his throat, and he waited in feverish suspense to learn whether success or failure was to be their fortune.

Faster now grew their progress, but would the stretch of ice prove a long enough area to give them the necessary momentum?

Every second they expected to hear horrible grinding noises from behind, such as must accompany the toppling over of the berg. Even the splash of waves against the further side of the big ice-floe seemed like the pounding of a monster hammer, at least to Jack's excited imagination.

They were now drawing perilously near the brink. Was Tom ever going to elevate the plane and attempt the rise from the flat surface of the ice?

Just when it seemed to Jack that hope must yield to despair he realized that the jumpy motion of the plane ceased suddenly. He knew what this meant, and that Tom had finally shown his hand, for they no longer b.u.mped along but began to move through s.p.a.ce!

Then Jack fell back, breathing freely again. Success had rewarded their efforts, and once more the big bomber was speeding through its own element on the wings of the wind.

But it had indeed been a narrow escape for the adventurous trio; for hardly had they started to swing upward into s.p.a.ce when from behind them arose a series of horrible crashings, gurglings, and the mad splashing of water, telling that in truth the giant berg had carried out its threat and rolled completely over, playing havoc with the entire floe.

No one spoke immediately. In fact, none of them could have uttered a word, no matter how hard he had tried. In each young heart a feeling of intense grat.i.tude reigned, as well as a sensation of horror, for only too well did they know what their immediate fate must have been had they remained prisoners on the ice but another two minutes.

Tom pointed the nose of the plane directly into the southwest. He even seemed to be getting additional speed out of his motors, as though bent on making up for the lost time.

All of them began to settle down for another long monotonous period with the whole night before them. Far from comfortable might be their situation, but not a single complaint would be heard. All they asked was that things might go on as they were, with the plane reeling off knot after knot of the cruise into the west.

After a while Jack remembered that Tom had had but a bite of supper.

Accordingly he got out the supplies and proceeded to serve them. Then he took Tom's place for a while and held the airship true to her course.