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He said to himself: "When I shall have made my balls of blueing, I shall be rich, I will withdraw my copperplates from the pawn-shop, I will put my Flora in vogue again with trickery, plenty of money and advertisements in the newspapers and I will buy, I know well where, a copy of Pierre de Medine's Art de Naviguer, with wood-cuts, edition of 1655."
Galien, a French monk, published a book L'art de naviguer dans l'air in 1757, in which it was conjectured that the air at high levels was lighter than that immediately over the surface of the earth. Galien proposed to bring down the upper layers of air and with them fill a vessel, which by Archimidean principle would rise through the heavier atmosphere.
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