As for the driver, hidden in the interior of his machine, he had been quite invisible. He remained as unknown as when he had first appeared on the various roads throughout the country.

Milwaukee was promptly warned of the coming of this interloper. Fancy the excitement the news caused! The immediate purpose agreed upon was to stop this projectile, to erect across its route an obstacle against which it would smash into a thousand pieces. But was there time? Would not the machine appear at any moment? And what need was there, since the track ended on the edge of Lake Michigan, and so the vehicle would be forced to stop there anyway, unless its supernatural driver could ride the water as well as the land.

Here, also, as all along the route, the most extravagant suggestions were offered. Even those who would not admit that the mysterious chauffeur must be Satan in person allowed that he might be some monster escaped from the fantastic visions of the Apocalypse.

And now there were no longer minutes to wait. Any second might bring the expected apparition.

It was not yet eleven o'clock when a rumbling was heard far down the track, and the dust rose in violent whirlwinds. Harsh whistlings shrieked through the air warning all to give passage to the monster.

It did not slacken speed at the finish. Lake Michigan was not half a mile beyond, and the machine must certainly be hurled into the water! Could it be that the mechanician was no longer master of his mechanism?

There could be little doubt of it. Like a shooting star, the vehicle flashed through Milwaukee. When it had passed the city, would it plunge itself to destruction in the waters of Lake Michigan?

At any rate when it disappeared at a slight bend in the road no trace was to be found of its passage.

Chapter 5

ALONG THE SHORES OF NEW ENGLAND

At the time when the newspapers were filled with these reports, I was again in Washington. On my return I had presented myself at my chief's office, but had been unable to see him. Family affairs had suddenly called him away, to be absent some weeks. Mr. Ward, however, undoubtedly knew of the failure of my mission. The newspapers, especially those of North Carolina, had given full details of our ascent of the Great Eyrie.

Naturally, I was much annoyed by this delay which further fretted my restless curiosity. I could turn to no other plans for the future. Could I give up the hope of learning the secret of the Great Eyrie? No! I would return to the attack a dozen times if necessary, and despite every failure.

Surely, the winning of access within those walls was not a task beyond human power. A scaffolding might be raised to the summit of the cliff; or a tunnel might be pierced through its depth. Our engineers met problems more difficult every day. But in this case it was necessary to consider the expense, which might easily grow out of proportion to the advantages to be gained. A tunnel would cost many thousand dollars, and what good would it accomplish beyond satisfying the public curiosity and my own?

My personal resources were wholly insufficient for the achievement. Mr. Ward, who held the government's funds, was away. I even thought of trying to interest some millionaire. Oh, if I could but have promised one of them some gold or silver mines within the mountain! But such an hypothesis was not admissible. The chain of the Appalachians is not situated in a gold bearing region like that of the Pacific mountains, the Transvaal, or Australia.

It was not until the fifteenth of June that Mr. Ward returned to duty. Despite my lack of success he received me warmly. "Here is our poor Strock!" cried he, at my entrance. "Our poor Strock, who has failed!"

"No more, Mr. Ward, than if you had charged me to investigate the surface of the moon," answered I. "We found ourselves face to face with purely natural obstacles insurmountable with the forces then at our command."

"I do not doubt that, Strock, I do not doubt that in the least. Nevertheless, the fact remains that you have discovered nothing of what is going on within the Great Eyrie."

"Nothing, Mr.