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 Tower the motor had worked fairly well. Now, after I had left it some 500 metres behind me, the motor was actually on the point of stopping. I had a moment of great uncertainty. I must make a quick decision. It was to abandon the steering wheel for a moment, at the risk of drifting from my course, in order to devote my attention to the carburating lever and the lever controlling the electric spark. The motor, which had almost stopped, began to work again. I had now reached the Bois, where, by a phenomenon known to all aeronauts, the cool air from the trees began making my balloon heavier and heavier—or in true physics, smaller by condensation. By an unlucky coincidence the motor at this moment began slowing again. Thus the air-ship was descending, while its motive power was decreasing. To correct the descent I had to throw back both guide rope and shifting weights. This caused the air-ship to point diagonally upward, so that what propeller-force remained caused it to remount continually in the air. I was now over the crowd of the Auteuil racetrack, already with a sharp pointing upward. I heard the applause of the mighty throng, when