We all piled into the trucks that we had used to transport supplies and materials from the shore to the camp, which lay inland a few miles, and bumped over our makeshift road to the little table-land where the giant torpedo lay upon its mile long track. “Everything is ready,” said Jimmy. “We polished off the last details this morning. Every roller on the track has been inspected by at least a dozen men, we towed the old crate back and forth over the full length of the track three times with the truck, and then repacked all the rollers with grease. Three of us have checked over every item of equipment and supplies individually; we’ve done about everything but fire the rockets; and now we’re ready to go—you _are_ going to take me along, aren’t you, Car?” I shook my head. “Please don’t, Jimmy,” I begged; “I have a perfect right to gamble with my own life, but not with yours; so forget it. But I am going to do something for you,” I added, “just as a token of my appreciation of the help you’ve given me and all that sort of rot. I’m going to give you my ship to remember me by.” He was grateful, of course, but still he could not hide his disappointment in not being allowed to accompany me, which was evidenced by an invidious comparison he drew between the ceiling of the Sikorsky and that of the old crate, as he had affectionately dubbed the great torpedolike rocket that was to bear me out into space in a few hours. “A thirty-five million mile ceiling,” he mourned dolefully; “think of it! Mars for a ceiling!” “And may I hit the ceiling!” I exclaimed, fervently. The laying of the track upon which the torpedo was to take off had been the subject of a year of calculation and consultation. The day of departure had been planned far ahead and the exact point at which Mars would rise above the eastern horizon on that night calculated, as well as the time; then it was necessary to make allowances for the rotation of the earth and the attraction of the nearer heavenly bodies. The track was then laid in accordance with these calculations. It was constructed with a very slight drop in the first three quarters of a mile and then rose gradually at an angle of two and one half degrees from horizontal. A speed of four and one half miles per second at the take-off would be sufficient to neutralize gravity; to overcome it, I must attain a speed of 6.93 miles per second. To allow a sufficient factor of safety I had powered the torpedo to attain a speed of seven miles per second at the end of the runway, which I purposed stepping up to ten miles per second while passing through the earth’s atmosphere. What my speed would be through space was problematical, but I based all my calculations on the theory that it would not deviate much from the speed at which I left the earth’s atmosphere, until I came within the influence of the gravitational pull of Mars.