"Well, let's get to Mars," said Jack. "Maybe Andy can find some new kind of game there." "Me? I'm not going to any place so many millions of miles away from here," answered the old hunter, looking up from his plate. "It's good enough hunting here." "Wait until you see," said Mr. Roumann with a smile. "I expect to find many marvels on Mars." "If we get there," added Mr. Henderson. "We'll get there," declared Mr. Roumann confidently. "As I said, I have long been interested in Mars, and one reason is that I want to prove that there is life on it--that it is inhabited by a superior race of beings. Another reason is that I expect to find on it a supply--or at least specimens--of a most valuable substance--" Mr. Roumann stopped suddenly. "Well?" asked Mr. Henderson questioningly, for there was an odd manner about the blue-eyed scientist. "That is something I do not wish to speak about at present," said Mr. Roumann quickly. "I will tell you my other reason for going to Mars--when we get there." "Now, as to the method. As I told you, Professor Henderson, and as I intimated to you boys, we will go in a long, torpedo-shaped projectile, which, though it will not be very large in diameter, will be long enough to contain all our machinery and ourselves, with a sufficient store of provisions for a year or more. But I know what you are going to ask, and that is: How can I send the projectile through space? "Well, I'll tell you--that is, partly tell you, for some parts of my secret can never be revealed. I have discovered a wonderful power, more wonderful than man ever dreamed of before. I have called it Etherium, for the reason that I expect it to carry us through the ether, or space that exists outside of the atmosphere of this earth and that of Mars. "Now, professor, do you think you and your assistants can build a proper projectile?" "We built an airship that went to the North Pole, we constructed a submarine that took us to the South Pole, and we had the Flying Mermaid, in which we went to the center of the earth," said Mr. Henderson. "I think we can build you the torpedo-shaped projectile. But what will make it move through thirty-five millions of miles of space?" "I will!" exclaimed the other. "I and my wonderful, secret power--Etherium! If you will build the projectile I will do the rest. I will give you the plans for the machinery at once, and you can begin as soon as you are ready. You have a large workshop here, I understand." "Yes, we have all the means at our command," admitted Mr. Henderson. "But it must be built in secret," stipulated Mr. Roumann. "No one must know about it until we are ready to leave. Several unscrupulous men have tried to steal my secret." "We can construct the projectile and machinery so that no one but ourselves, and one or two trusty mechanics, will ever know about it," promised Mr. Henderson.