Should this prove to be true, he might now consider himself a prisoner of this piratical band, the members of which, although temporarily disabled, would soon regain consciousness.

He sat in the bow, sadly thinking of his misfortunes, until he noticed that one of the men began to stir. The effect of the electric shock conveyed by the tube was beginning to wear away, and now the buccaneer sat up, rubbed his head in a bewildered fashion and looked around him.

When he saw Rob he gave a shout of rage and drew his knife, but one motion of the electric tube made him cringe and slip away to the cabin, where he remained out of danger.

And now the other four sat up, groaning and muttering in their outlandish speech; But they had no notion of facing Rob's tube a second time, so one by one they joined their leader in the cabin, leaving the boy undisturbed.

By this time the ship had begun to pitch and toss in an uncomfortable fashion, and Rob noticed that the breeze had increased to a gale.

There being no one to look after the sails, the vessel was in grave danger of capsizing or breaking her masts. The waves were now running high, too, and Rob began to be worried.

Presently the captain of the pirates stuck his head out of the cabin door, jabbered some unintelligible words and pointed to the sails. The boy nodded, for he understood they wanted to attend to the rigging. So the crew trooped forth, rather fearfully, and began to reef the sails and put the ship into condition to weather the storm.

Rob paid no further attention to them. He looked at his traveling machine rather doubtfully and wondered if he dared risk its power to carry him through the air. Whether he remained in the ship or trusted to the machine, he stood a good chance of dropping into the sea at any moment. So, while he hesitated, he attached the machine to his wrist and leaned over the bulwarks to watch the progress of the storm. He might stay in the ship until it foundered, he thought, and then take his chances with the machine. He decided to wait until a climax arrived.

The climax came the next moment, for while he leaned over the bulwarks the buccaneers stole up behind him and suddenly seized him in their grasp. While two of them held his arms the others searched his pockets, taking from him the electric tube and the silver box containing his tablets. These they carried to the cabin and threw upon the heap of other valuables they had stolen. They did not notice his traveling machine, however, but seeing him now unarmed they began jeering and laughing at him, while the brutal captain relieved his anger by giving the prisoner several malicious kicks.

Rob bore his misfortune meekly, although he was almost ready to cry with grief and disappointment. But when one of the pirates, to inflict further punishment on the boy, came towards him with a heavy strap, he resolved not to await the blow.

Turning the indicator to the word "up" he found, to his joy and relief, that it would yet obey the influence of the power of repulsion. Seeing him rise into the air the fellow made a grab for his foot and held it firmly, while his companions ran to help him. Weight seemed to make no difference in the machine; it lifted the pirate as well as Rob; it lifted another who clung to the first man's leg, and another who clung to him. The other two also caught hold, hoping their united strength would pull him down, and the next minute Rob was soaring through the air with the entire string of five buccaneers dangling from his left leg.

At first the villains were too astounded to speak, but as they realized that they were being carried through the air and away from their ship they broke into loud shouts of dismay, and finally the one who grasped Rob's leg lost his hold and the five plunged downward and splashed into the sea.

Finding the machine disposed to work accurately, Rob left the buccaneers to swim to the ship in the best way they could, while he dropped down to the deck again and recovered from the cabin his box of tablets and the electric tube. The fellows were just scrambling on board when he again escaped, shooting into the air with considerable speed.

Indeed, the instrument now worked better than at any time since he had reached the cannibal island, and the boy was greatly delighted.

The wind at first sent him spinning away to the south, but he continued to rise until he was above the air currents, and the storm raged far beneath him. Then he set the indicator to the northwest and breathlessly waited to see if it would obey. Hurrah! away he sped at a fair rate of speed, while all his anxiety changed to a feeling of sweet contentment.

His success had greatly surprised him, but he concluded that the jar caused by dropping the instrument had relieved the pressure upon the works, and so helped rather than harmed the free action of the electric currents.

While he moved through the air with an easy, gliding motion he watched with much interest the storm raging below. Above his head the sun was peacefully shining and the contrast was strange and impressive. After an hour or so the storm abated, or else he pa.s.sed away from it, for the deep blue of the ocean again greeted his eyes. He dropped downward until he was about a hundred feet above the water, when he continued his northwesterly course.

But now he regretted having interfered for a moment with the action of the machine, for his progress, instead of being swift as a bird's flight, became slow and jerky, nor was he sure that the damaged machine might not break down altogether at any moment. Yet so far his progress was in the right direction, and he resolved to experiment no further with the instrument, but to let it go as it would, so long as it supported him above the water. However irregular the motion might be, it was sure, if continued, to bring him to land in time, and that was all he cared about just then.

When night fell his slumber was broken and uneasy, for he wakened more than once with a start of fear that the machine had broken and he was falling into the sea. Sometimes he was carried along at a swift pace, and again the machine scarcely worked at all; so his anxiety was excusable.

The following day was one of continued uneasiness for the boy, who began to be harra.s.sed by doubts as to whether, after all, he was moving in the right direction. The machine had failed at one time in this respect and it might again. He had lost all confidence in its accuracy.

In spite of these perplexities Rob pa.s.sed the second night of his uneven flight in profound slumber, being exhausted by the strain and excitement he had undergone. When he awoke at daybreak, he saw, to his profound delight, that he was approaching land.

The rising sun found him pa.s.sing over a big city, which he knew to be Boston.

He did not stop. The machine was so little to be depended upon that he dared make no halt. But he was obliged to alter the direction from northwest to west, and the result of this slight change was so great a reduction in speed that it was mid-day before he saw beneath him the familiar village in which he lived.

Carefully marking the location of his father's house, he came to a stop directly over it, and a few moments later he managed to land upon the exact spot in the back yard whence he had taken his first successful flight.

7. The Demon Becomes Angry

When Rob had been hugged and kissed by his mother and sisters, and even Mr. Joslyn had embraced him warmly, he gave them a brief account of his adventures. The story was received with many doubtful looks and much grave shaking of heads, as was quite natural under the circ.u.mstances.

"I hope, my dear son," said the father, "that you have now pa.s.sed through enough dangers to last you a lifetime, so that hereafter you will be contented to remain at home."

"Oh, Robert!" cried his mother, with tears in her loving eyes, "you don't know how we've all worried about you for the past week!"

"A week?" asked Rob, with surprise.

"Yes; it's a week to-morrow morning since you flew into the air and disappeared."

"Then," said the boy, thoughtfully, "I've reached home just in time."

"In time for what?" she asked.

But he did not answer that question. He was thinking of the Demon, and that on the afternoon of this very day he might expect the wise and splendid genius to visit him a second time.

At luncheon, although he did not feel hungry, he joined the family at the table and pleased his mother by eating as heartily as of old. He was surprised to find how good the food tasted, and to realize what a pleasure it is to gratify one's sense of taste. The tablets were all right for a journey, he thought, but if he always ate them he would be sure to miss a great deal of enjoyment, since there was no taste to them at all.

At four o'clock he went to his workshop and unlocked the door.

Everything was exactly as he had left it, and he looked at his simple electrical devices with some amus.e.m.e.nt. They seemed tame beside the wonders now in his possession; yet he recollected that his numerous wires had enabled him to strike the Master Key, and therefore should not be despised.

Before long he noticed a quickening in the air, as if it were suddenly surcharged with electric fluid, and the next instant, in a dazzling flash of light, appeared the Demon.

"I am here!" he announced.

"So am I," answered Rob. "But at one time I really thought I should never see you again. I've been--"

"Spare me your history," said the Demon, coldly. "I am aware of your adventures."

"Oh, you are!" said Rob, amazed. "Then you know--"

"I know all about your foolish experiences," interrupted the Demon, "for I have been with you constantly, although I remained invisible."

"Then you know what a jolly time I've had," returned the boy. "But why do you call them foolish experiences?"

"Because they were, abominably foolish!" retorted the Demon, bitterly.

"I entrusted to you gifts of rare scientific interest--electrical devices of such utility that their general adoption by mankind would create a new era in earth life. I hoped your use of these devices would convey such hints to electrical engineers that they would quickly comprehend their mechanism and be able to reproduce them in sufficient quant.i.ties to supply the world. And how do you treat these marvelous gifts? Why, you carry them to a cannibal island, where even your crude civilization has not yet penetrated!"

"I wanted to astonish the natives," said Rob, grinning.

The Demon uttered an exclamation of anger, and stamped his foot so fiercely that thousands of electric sparks filled the air, to disappear quickly with a hissing, crinkling sound.

"You might have astonished those ignorant natives as easily by showing them an ordinary electric light," he cried, mockingly. "The power of your gifts would have startled the most advanced electricians of the world. Why did you waste them upon barbarians?"

"Really," faltered Rob, who was frightened and awed by the Demon's vehement anger, "I never intended to visit a cannibal island. I meant to go to Cuba."

"Cuba! Is that a center of advanced scientific thought? Why did you not take your marvels to New York or Chicago; or, if you wished to cross the ocean, to Paris or Vienna?"