chunk: Having demonstrated his rule over the skies, Robur returns the three men to the ground. In a short speech, Robur says that nations are not yet fit for union. He cautions the crowd that it is evolution, not revolution, that they should be seeking. He leaves with the promise that he will one day return to reveal his secrets of flight. The people of Philadelphia subject Prudent and Evans to unrelenting ridicule for the rest of their lives.