"Drop! She can't. The thing's impossible so long as the current is—but what's the use of my explaining to you? She can no more drop than you can fly."

"But suppose she did," I persisted.

"Well, such a thing can't possibly happen, unless the current is turned off too suddenly, and if it did, nobody would be hurt, because the pneumatic buffers on her bottom would make the contact with earth scarcely more than perceptible. No, my dear fellow, she can't go up, or she can't come down until I want her to, but when I do, up or down she goes. In short she is under absolute control. When the current is at the neutralizing point it is as natural for the air ship to float in the upper atmosphere as for you to walk on dry land, or a fish to swim. Don't be uneasy. I tell you I have mastered the secret of aerial navigation."

I had to be satisfied, and was really full of confidence in Terry's ability.

"Do you propose to make a long journey to begin with?" I inquired.

"Yes," said Torrence, "a very extended one, as you will see for yourself. I have had her stocked with enough provisions to run this hotel, figuratively speaking, for a year, and all manner of other necessaries; in fact, we shall be supplied with all the luxuries of life. You won't mind going with me, old man, will you, and letting me act as your pilot?"

"To be sure not; but when shall we be off?"

"Very soon. But you must not say a word to any one. Remember our movements are not to be known. Have I your word?"

I promised; but why he demanded this I was at a loss to guess.

Before going to bed that night Torrence told me that he should probably be absent a couple of days attending to the final equipment of the machine; and when I bid him good-night it was with the understanding that we should not meet for a day or two. He would certainly return before the end of the week; and I was to have everything ready for leaving at a moment's notice, as he was anxious there should be no delay. That was on Tuesday. Imagine, therefore, my surprise upon seeing him enter my bedroom at a late hour Wednesday night. I had been in bed long enough to fall asleep, and was aroused by a light shining in my eyes. There was a strange look in Torry's face, and I started up alarmed.