The lights of Philadelphia showed up ahead, and a thought struck me. What would Philadelphians of 1776 have thought to see this DC-6 flying across their city at three hundred miles an hour? What would the sentries at Valley Forge have done, a year later, if this lighted airliner had streaked over their heads? Madness. Stampede. Those were the plain answers. But there was a difference now. We had had modern miracles, radio, television, supersonic planes, and the promise of still more miracles. _We_ could be educated, or at least partly prepared, to accept space visitors. In fifty years we had learned to fly. In fifty years more, we would be exploring space. Why should we believe such creative intelligence was limited to the earth? It would be incredible if the earth, out of all the millions of planets, proved the only inhabited spot in the whole universe. But, instinctively, I still fought against believing that the flying saucers were space ships. Eventually, we would make contact with races on other planets; they undoubtedly would someday visit the earth. But if it could be put off . . . a problem for later generations to handle . . . If the disks proved American guided missiles, it would be an easier answer. Looking through the Project “Saucer” report DuBarry had loaned me, I read the space-travel items, hoping to find some hint that this was a smoke screen. On page 18, in a discussion on Mars, I found this comment: “Reports of strange objects seen in the skies have been handed down through the generations. However, scientists believe that if Martians were now visiting the earth without establishing contact, it could be assumed that they have just recently succeeded in space travel, and that their civilization would be practically abreast of ours. This because they find it hard to believe that any technically established race would come here, flaunt its ability in mysterious ways over the years, but each time simply go way without ever establishing contact.” There could be several answers to that. The Martians might not be able to live in our atmosphere, except in their sealed space ships. They, or some other planet race, could have observed us periodically to check on our slow progress. Until we began to approach their level of civilization, or in some way caused them concern, they would probably see no reason for trying to make contact. But somehow I found a vague comfort in the argument, full of holes though it was. Searching further, I found other space-travel comments. On one page, the Air Force admitted it was almost a certainty that space travelers would be operating from planets outside the solar system. But on the following page, I discovered this sentence: “Thus, although visits from outer space are believed to be possible, they are thought to be highly improbable.”