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 IN the middle of September 1898 I was ready to begin in the open air. The rumour had spread among the aeronauts of Paris, who formed the nucleus of the Aéro Club, that I was going to carry up a petroleum motor in my basket. They were sincerely disquieted by what they called my temerity, and some of them made friendly efforts to show me the permanent danger of such a motor under a balloon filled with a highly inflammable gas. They begged me instead to use the electric motor—"which is infinitely less dangerous." I had arranged to inflate the balloon at the Jardin d'Acclimatation, where a captive balloon was already installed and furnished with everything needful daily. This gave me facilities for obtaining, at one franc per cubic metre, the 180 cubic metres (6354 cubic feet) of hydrogen which I needed. On September 18th my first air-ship — the