It would only be necessary to reshape the craft a little, and this was the easier because the aero was put together in such a manner with screw-bolts and nuts that it could be articulated or disarticulated as readily as a watch. He had entire confidence in his engineering skill, and in the ability of the three experienced men of the crew to aid him. He decided to employ the planes for outriders, which would serve to increase the buoyancy and stability. As soon as he had completed his plan in his mind he explained his intentions to the President. The latter and the other members of the party were at first as much startled as surprised by the idea of embarking on a voyage of eleven hundred miles in so questionable a craft, but Professor Pludder assured them that everything would go well. "But how about the propulsion?" asked Mr. Samson. "You can't depend on the wind, and we've got no sails." "I have thought that all out," said Pludder. "I shall use the engine, and rearrange one of the aerial screws so that it will serve for a propeller. I do not expect to get up any great speed, but if we can make only as much as two miles an hour we shall arrive on the borders of the Colorado upland, five thousand feet above sea, within about twenty-three days. We may be able to do better than that." Nobody felt much confidence in this scheme except its inventor, but it appeared to be the only thing that could be done, and so they all fell to work, each aiding as best he could, and after four days of hard work the remarkable craft was ready for its adventurous voyage. Professor Pludder had succeeded even better than he anticipated in transforming one of the aerial screws into a propeller. Its original situation was such that it naturally, as it were, fell into the proper place when the "hull" was partly submerged, and, the blades being made of concentric rows of small plates, there was no difficulty in reducing them to a manageable size. The position of the engine did not need to be shifted at all. The "outriders," made up of the discarded planes, promised to serve their purpose well, and the cabin remained for a comfortable "deck-house." A rudder had been contrived by an alteration of the one which had served for guiding the aero in its flights. The water was close to their feet, and there was no great difficulty in pushing the affair off the rocks and getting it afloat. The women and children were first put aboard, and then the men scrambled in, and Pludder set the motors going. The improvised propeller churned and spluttered, but it did its work after a fashion, and, under a blue sky, in dazzling sunshine, with a soft southerly breeze fanning the strange sea that spread around them, they soon saw the bared rocks and deeply scored flanks of Mount Mitchell receding behind them. They were delighted to find that they were making, at the very start, no less than three miles an hour. Pludder clapped his hands and exclaimed: