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 go against the wind that was then blowing, therefore I had intended to place it for the start at precisely the other end of the open space from that which I have described—that is, down stream, and not up stream in the air current with relation to the open space surrounded by trees. I would thus move out of the open space without difficulty, having the wind against me—for under such conditions the relative speed of the air-ship ought to be the difference between its absolute speed and the velocity of the wind—and so by going against the air current I should have plenty of time to rise and pass over the trees. Evidently it would be a mistake to place the air-ship at a point suitable for an ordinary balloon without motor and propeller. And yet it was there that I did place it, not by my own will, but by the will of the professional aeronauts who came in the crowd to be present at my experiment. In vain I explained that by placing myself "up stream" in the wind with relation to the centre of the open space I should inevitably risk precipitating the air-ship against the trees before I would have time to rise above them, the speed of my propeller being superior to that of the wind then blowing.