"I never made so quick a preparation, nor attempted so long a trip. I have left my friends a lot of guessing! Now, how soon shall we be off?" "Within an hour," he answered. "Mars will not be directly overhead until midnight, but there is a little side trip I wish to make first, to test the projectile before we get too far above the Earth's surface." The sky was densely cloudy, there was no Moon, and it was already growing very dark. As we began to have difficulty in finding the way, the doctor lighted his lantern. Peering up into the darkness, I said to him,-- "There is not a star visible. How are you to find your way in the heavens a night like this?" "That is all perfectly easy. We shall soon rise far above those clouds, and then the stars will come out. Besides, I shall show you perfect daylight again before midnight." "I don't see just how, but I will take your word for it, Doctor. I daresay you have thought it all out, and the whole trip will contain no surprises for you." "I have tried to think it all out and prepare for everything. But I am certain I have forgotten something. I have a feeling amounting to a dreadful presentiment that I have overlooked something important. I wish you would see if you can think of anything I have omitted." "The only really important thing I have remembered is half a dozen boxes of the best cigars," I replied. "Leave them right here in Whiting," he said with emphasis. "We are carrying only a limited supply of pure air, and we cannot afford to contaminate it with tobacco smoke. No, sir, you can't smoke on this trip." "Then I won't go! Imagine not smoking for two whole months! Do you think I have sworn off?" "No, not yet. But you must. It pollutes the air, which we must keep clean and fresh as long as possible." "Now, Doctor, you must let me have a good smoke once a day, just before pumping the air out of my compartment." "No, not even that. It is impossible to pump all the air out, and what is left mixes back with what is in my compartment. Once contaminated with tobacco smoke, we could never get it perfectly pure again." "Well, may I smoke on Mars, then? I will take them along for that. But, I warn you, I eat like a farm horse when I can't smoke." "I have provided plenty to eat, but I know I have forgotten something. Mention something now, mention everything you can think of, so that I may see if it is provided for." "Have you any money?" I asked. "I have changed some into gold, and have a fairly heavy bag here." "Oh, yes, I have some gold and silver money, besides a lot of beads, trinkets, and gaudy tinsel things, such as earthly savages have been willing to barter valuable merchandise for." "So you are going on a trading expedition, are you?" I asked. "Not exactly. I leave all that to your superior abilities. But we may find these things valuable to give as presents. Many of them are of tin, and if they do not happen to have that useful metal on Mars, they will be of rare value there."