At the cabin entrance the sailor halted to watch, permitting Paulvitch to go alone to his cabin. Here he gathered together his few belongings that were to buy him the uncertain safety of escape, and as he stood for a moment beside the little table on which he had piled them he searched his brain for some feasible plan either to ensure his safety or to bring revenge upon his enemies.

And presently as he thought there recurred to his memory the little black box which lay hidden in a secret receptacle beneath a false top upon the table where his hand rested.

The Russian's face lighted to a sinister gleam of malevolent satisfaction as he stooped and felt beneath the table top. A moment later he withdrew from its hiding-place the thing he sought. He had lighted the lantern swinging from the beams overhead that he might see to collect his belongings, and now he held the black box well in the rays of the lamplight, while he fingered at the clasp that fastened its lid.

The lifted cover revealed two compartments within the box. In one was a mechanism which resembled the works of a small clock. There also was a little battery of two dry cells. A wire ran from the clockwork to one of the poles of the battery, and from the other pole through the partition into the other compartment, a second wire returning directly to the clockwork.

Whatever lay within the second compartment was not visible, for a cover lay over it and appeared to be sealed in place by asphaltum. In the bottom of the box, beside the clockwork, lay a key, and this Paulvitch now withdrew and fitted to the winding stem.

Gently he turned the key, muffling the noise of the winding operation by throwing a couple of articles of clothing over the box. All the time he listened intently for any sound which might indicate that the sailor or another were approaching his cabin; but none came to interrupt his work.

When the winding was completed the Russian set a pointer upon a small dial at the side of the clockwork, then he replaced the cover upon the black box, and returned the entire machine to its hiding-place in the table.

A sinister smile curled the man's bearded lips as he gathered up his valuables, blew out the lamp, and stepped from his cabin to the side of the waiting sailor.

"Here are my things," said the Russian; "now let me go."

"I'll first take a look in your pockets," replied the sailor. "You might have overlooked some trifling thing that won't be of no use to you in the jungle, but that'll come in mighty handy to a poor sailorman in London. Ah! just as I feared," he ejaculated an instant later as he withdrew a roll of bank-notes from Paulvitch's inside coat pocket.

The Russian scowled, muttering an imprecation; but nothing could be gained by argument, and so he did his best to reconcile himself to his loss in the knowledge that the sailor would never reach London to enjoy the fruits of his thievery.

It was with difficulty that Paulvitch restrained a consuming desire to taunt the man with a suggestion of the fate that would presently overtake him and the other members of the Kincaid's company; but fearing to arouse the fellow's suspicions, he crossed the deck and lowered himself in silence into his canoe.

A minute or two later he was paddling toward the shore to be swallowed up in the darkness of the jungle night, and the terrors of a hideous existence from which, could he have had even a slight foreknowledge of what awaited him in the long years to come, he would have fled to the certain death of the open sea rather than endure it.

The sailor, having made sure that Paulvitch had departed, returned to the forecastle, where he hid away his booty and turned into his bunk, while in the cabin that had belonged to the Russian there ticked on and on through the silences of the night the little mechanism in the small black box which held for the unconscious sleepers upon the ill-starred Kincaid the coming vengeance of the thwarted Russian.

Chapter 19

The Last of the "Kincaid"

Shortly after the break of day Tarzan was on deck noting the condition of the weather. The wind had abated. The sky was cloudless. Every condition seemed ideal for the commencement of the return voyage to Jungle Island, where the beasts were to be left. And then—home!

The ape-man aroused the mate and gave instructions that the Kincaid sail at the earliest possible moment. The remaining members of the crew, safe in Lord Greystoke's assurance that they would not be prosecuted for their share in the villainies of the two Russians, hastened with cheerful alacrity to their several duties.

The beasts, liberated from the confinement of the hold, wandered about the deck, not a little to the discomfiture of the crew in whose minds there remained a still vivid picture of the savagery of the beasts in conflict with those who had gone to their deaths beneath the fangs and talons which even now seemed itching for the soft flesh of further prey.

Beneath the watchful eyes of Tarzan and Mugambi, however, Sheeta and the apes of Akut curbed their desires, so that the men worked about the deck amongst them in far greater security than they imagined.

At last the Kincaid slipped down the Ugambi and ran out upon the shimmering waters of the Atlantic. Tarzan and Jane Clayton watched the verdure-clad shore-line receding in the ship's wake, and for once the ape-man left his native soil without one single pang of regret.

No ship that sailed the seven seas could have borne him away from Africa to resume his search for his lost boy with half the speed that the Englishman would have desired, and the slow-moving Kincaid seemed scarce to move at all to the impatient mind of the bereaved father.

Yet the vessel made progress even when she seemed to be standing still, and presently the low hills of Jungle Island became distinctly visible upon the western horizon ahead.

In the cabin of Alexander Paulvitch the thing within the black box ticked, ticked, ticked, with apparently unending monotony; but yet, second by second, a little arm which protruded from the periphery of one of its wheels came nearer and nearer to another little arm which projected from the hand which Paulvitch had set at a certain point upon the dial beside the clockwork. When those two arms touched one another the ticking of the mechanism would cease—for ever.

Jane and Tarzan stood upon the bridge looking out toward Jungle Island. The men were forward, also watching the land grow upward out of the ocean. The beasts had sought the shade of the galley, where they were curled up in sleep. All was quiet and peace upon the ship, and upon the waters.

Suddenly, without warning, the cabin roof shot up into the air, a cloud of dense smoke puffed far above the Kincaid, there was a terrific explosion which shook the vessel from stem to stern.

Instantly pandemonium broke loose upon the deck. The apes of Akut, terrified by the sound, ran hither and thither, snarling and growling. Sheeta leaped here and there, screaming out his startled terror in hideous cries that sent the ice of fear straight to the hearts of the Kincaid's crew.

Mugambi, too, was trembling. Only Tarzan of the Apes and his wife retained their composure. Scarce had the debris settled than the ape-man was among the beasts, quieting their fears, talking to them in low, pacific tones, stroking their shaggy bodies, and assuring them, as only he could, that the immediate danger was over.

An examination of the wreckage showed that their greatest danger, now, lay in fire, for the flames were licking hungrily at the splintered wood of the wrecked cabin, and had already found a foothold upon the lower deck through a great jagged hole which the explosion had opened.

By a miracle no member of the ship's company had been injured by the blast, the origin of which remained for ever a total mystery to all but one—the sailor who knew that Paulvitch had been aboard the Kincaid and in his cabin the previous night. He guessed the truth; but discretion sealed his lips. It would, doubtless, fare none too well for the man who had permitted the arch enemy of them all aboard the ship in the watches of the night, where later he might set an infernal machine to blow them all to kingdom come. No, the man decided that he would keep this knowledge to himself.

As the flames gained headway it became apparent to Tarzan that whatever had caused the explosion had scattered some highly inflammable substance upon the surrounding woodwork, for the water which they poured in from the pump seemed rather to spread than to extinguish the blaze.

Fifteen minutes after the explosion great, black clouds of smoke were rising from the hold of the doomed vessel. The flames had reached the engine-room, and the ship no longer moved toward the shore. Her fate was as certain as though the waters had already closed above her charred and smoking remains.

"It is useless to remain aboard her longer," remarked the ape-man to the mate. "There is no telling but there may be other explosions, and as we cannot hope to save her, the safest thing which we can do is to take to the boats without further loss of time and make land."

Nor was there other alternative. Only the sailors could bring away any belongings, for the fire, which had not yet reached the forecastle, had consumed all in the vicinity of the cabin which the explosion had not destroyed.

Two boats were lowered, and as there was no sea the landing was made with infinite ease. Eager and anxious, the beasts of Tarzan sniffed the familiar air of their native island as the small boats drew in toward the beach, and scarce had their keels grated upon the sand than Sheeta and the apes of Akut were over the bows and racing swiftly toward the jungle. A half-sad smile curved the lips of the ape-man as he watched them go.

"Good-bye, my friends," he murmured. "You have been good and faithful allies, and I shall miss you."

"They will return, will they not, dear?" asked Jane Clayton, at his side.

"They may and they may not," replied the ape-man. "They have been ill at ease since they were forced to accept so many human beings into their confidence. Mugambi and I alone affected them less, for he and I are, at best, but half human. You, however, and the members of the crew are far too civilized for my beasts—it is you whom they are fleeing. Doubtless they feel that they cannot trust themselves in the close vicinity of so much perfectly good food without the danger that they may help themselves to a mouthful some time by mistake."

Jane laughed. "I think they are just trying to escape you," she retorted. "You are always making them stop something which they see no reason why they should not do. Like little children they are doubtless delighted at this opportunity to flee from the zone of parental discipline. If they come back, though, I hope they won't come by night."

"Or come hungry, eh?" laughed Tarzan.

For two hours after landing the little party stood watching the burning ship which they had abandoned. Then there came faintly to them from across the water the sound of a second explosion. The Kincaid settled rapidly almost immediately thereafter, and sank within a few minutes.

The cause of the second explosion was less a mystery than that of the first, the mate attributing it to the bursting of the boilers when the flames had finally reached them; but what had caused the first explosion was a subject of considerable speculation among the stranded company.

Chapter 20

Jungle Island Again

The first consideration of the party was to locate fresh water and make camp, for all knew that their term of existence upon Jungle Island might be drawn out to months, or even years.

Tarzan knew the nearest water, and to this he immediately led the party. Here the men fell to work to construct shelters and rude furniture while Tarzan went into the jungle after meat, leaving the faithful Mugambi and the Mosula woman to guard Jane, whose safety he would never trust to any member of the Kincaid's cut-throat crew.

Lady Greystoke suffered far greater anguish than any other of the castaways, for the blow to her hopes and her already cruelly lacerated mother-heart lay not in her own privations but in the knowledge that she might now never be able to learn the fate of her first-born or do aught to discover his whereabouts, or ameliorate his condition—a condition which imagination naturally pictured in the most frightful forms.

For two weeks the party divided the time amongst the various duties which had been allotted to each. A daylight watch was maintained from sunrise to sunset upon a bluff near the camp—a jutting shoulder of rock which overlooked the sea. Here, ready for instant lighting, was gathered a huge pile of dry branches, while from a lofty pole which they had set in the ground there floated an improvised distress signal fashioned from a red undershirt which belonged to the mate of the Kincaid.

But never a speck upon the horizon that might be sail or smoke rewarded the tired eyes that in their endless, hopeless vigil strained daily out across the vast expanse of ocean.

It was Tarzan who suggested, finally, that they attempt to construct a vessel that would bear them back to the mainland. He alone could show them how to fashion rude tools, and when the idea had taken root in the minds of the men they were eager to commence their labours.