CHAPTER I Sail in the Sloop I see by the papers where Professor Fronac says that interplanetary travel will have to go through what he calls a period of incubation. He says that after reaching the moon, we now have hit so many new problems that we must sit down and puzzle out new theories to fit them before we can build a ship that will get us to Venus or Mars. Of course, the Army and Navy are supervising all rocket experiments these days, and the professor's remarks are censored by them. That m