I leave, and I carry my secret with me. It will not be lost to humanity, but shall be entrusted to them when they have learned not to abuse it. Farewell, Citizens of the United States!"

Then the "Albatross" rose under the impulse of its mighty screws, and sped away amidst the hurrahs of the multitude.

I have ventured to remind my readers of this last scene somewhat in detail, because it seemed to reveal the state of mind of the remarkable personage who now stood before me. Apparently he had not then been animated by sentiments hostile to humanity. He was content to await the future; though his attitude undeniably revealed the immeasurable confidence which he had in his own genius. the immense pride which his almost superhuman powers had aroused within him.

It was not astonishing, moreover, that this haughtiness had little by little been aggravated to such a degree that he now presumed to enslave the entire world, as his public letter had suggested by its significant threats. His vehement mind had with time been roused to such over-excitement that he might easily be driven into the most violent excesses.

As to what had happened in the years since the last departure of the "Albatross," I could only partly reconstruct this even with my present knowledge. It had not sufficed the prodigious inventor to create a flying machine, perfect as that was! He had planned to construct a machine which could conquer all the elements at once. Probably in the workshops of Island X, a selected body of devoted workmen had constructed, one by one, the pieces of this marvelous machine, with its quadruple transformation. Then the second "Albatross" must have carried these pieces to the Great Eyrie, where they had been put together, within easier access of the world of men than the far-off island had permitted. The "Albatross" itself had apparently been destroyed, whether by accident or design, within the eyrie. The "Terror" had then made its appearance on the roads of the United States and in the neighboring waters. And I have told under what conditions, after having been vainly pursued across Lake Erie, this remarkable masterpiece had risen through the air carrying me a prisoner on board.

Chapter 17

IN THE NAME OF THE LAW

What was to be the issue of this remarkable adventure? Could I bring it to any denouement whatever, either sooner or later? Did not Robur hold the results wholly in his own hands? Probably I would never have such an opportunity for escape as had occurred to Mr. Prudent and Mr. Evans amid the islands of the Pacific. I could only wait. And how long might the waiting last!

To be sure, my curiosity had been partly satisfied. But even now I knew only the answer to the problems of the Great Eyrie. Having at length penetrated its circle, I comprehended all the phenomena observed by the people of the Blueridge Mountains. I was assured that neither the country-folk throughout the region, nor the townfolk of Pleasant Garden and Morganton were in danger of volcanic eruptions or earthquakes. No subterranean forces whatever were battling within the bowels of the mountains. No crater had arisen in this corner of the Alleghanies. The Great Eyrie served merely as the retreat of Robur the Conqueror. This impenetrable hiding-place where he stored his materials and provisions, had without doubt been discovered by him during one of his aerial voyages in the "Albatross." It was a retreat probably even more secure than that as yet undiscovered Island X in the Pacific.

This much I knew of him; but of this marvelous machine of his, of the secrets of its construction and propelling force, what did I really know? Admitting that this multiple mechanism was driven by electricity, and that this electricity was, as we knew it had been in the "Albatross," extracted directly from the surrounding air by some new process, what were the details of its mechanism? I had not been permitted to see the engine; doubtless I should never see it.

On the question of my liberty I argued thus: Robur evidently intends to remain unknown.