“There I cannot follow you,” responded the doctor. “I am wanting in imagination; probably born so, as some people are born without an ear for music. Let us stick to facts. Among the recent discoveries in the field of which we have been talking was the finding of some small diamonds in a meteoric mass. Upon this some enthusiastic writer, whose imaginative soul would be your delight, Thorwald, built this argument: ‘Diamonds being pure carbon, their existence necessitates a previous vegetable growth. Hence vegetable life in other worlds is proven, and if vegetable life, it is fair to presume the existence of animal life also. Of course, then, there must be intelligent life, and therefore the stars, or the planets that revolve around the stars, are all filled with men.’ This I call not reasoning, but guessing.” “And still,” quickly responded Thorwald, “the discovery of diamonds in meteorites was a valuable link in the chain of evidence which you are putting together. Keep on with your investigations. Some time positive knowledge will come to you as it has come to us. But let me appeal once more to your reason. At an earlier stage of development your race no doubt believed the earth was the center of the universe, around which all the heavenly bodies swept in magnificent circles. You have learned that the earth itself, which was formerly thought to be so important an object, is only one of those heavenly bodies flying through space. You find the earth resembles its nearest companions in being subject to the same laws of motion which govern them, but you have yet to learn that they resemble the earth in the main purpose of their creation. You go into the forest and see thousands of trees. You can find no two alike, and yet all are alike in every material respect. Even the myriads of leaves are all different, and yet all alike. So why may not the millions of stars that fill the sky be like our own sun and like each other, differing in such immaterial things as size and brilliancy, color and constitution, but alike in the chief object of their being, the giving of light and heat, as vivifying forces to dark bodies surrounding them? And why may not these planets resemble the earth in being, at some stage of their existence, the theater of God’s great designs? “Let me try to excite your imagination in another way, Doctor. Suppose you should by and by awake and find this visit to Mars only a dream, and then suppose it should be revealed to you in some superhuman way that man was indeed the only race of intelligent beings in the whole universe; that the other planets and all the stars were of no real use; that not one world from that vast region of the milky way and far distant nebulae would ever send forth a note of praise to its Creator, and that the tiny earth was, after all, the center and sum of the universe--tell me, would you not feel lonesome?”