In the best words he could find he would express the impression which the Earth had made upon him. If he were a painter and if the Martians possess paint, he would paint pictures to express the feelings which a contemplation of the Earth had aroused in him. That is, he would show them the Beauty of the Earth in her various aspects. Perhaps he might not be able to see as much Beauty in her as we her children see. We may be too partial and see beauties that a stranger may not perceive. On the other hand, he might see beauties that we through being so accustomed to them have never recognised--as men living always within sight of some superb mountain scarcely appreciate its grandeur. Anyhow, he would describe to the Martians whatever he had seen of the Beauty of the Earth, and then at last they would feel that they were really able to know and understand her. To descend from these celestial spheres and to examine what actually happens among ourselves when we venture into an unknown portion of this globe and seek to know what is there, a chief ingredient in the lure which draws men on to fill up the blank spaces in the map is undoubtedly a love of Natural Beauty; and its Natural Beauty is certainly what above everything else regarding that region remains in their memories after it has been explored. It is not _only_ love of Natural Beauty that draws men on. Love of adventure has much to do with it also. Men feel a fearful joy in pitting themselves against stern natural obstacles and being compelled to exert all their physical energy and endurance, and all their wit and nerve and courage, in order to overcome them. The stiffer the obstacle, the more insistent do they feel the call to measure themselves against it. They thrill to the expectation of having their full capacities and faculties drawn out. By some curious natural instinct they seem driven to put themselves into positions where they are forced to exert themselves to the full stretch of their capabilities. This same instinct tells them that they will be never so happy as when they are making the very utmost of themselves and exercising their whole being at its highest pitch. Anticipation of their joy in adventure is therefore no small part of the lure which draws men into the unknown. And with it also is ambition to make a name and achieve fame. Some, too, are drawn on by the hope of wealth through finding gold, diamonds, and so on. But from what I have seen of gold and diamond prospectors on the spot in the act of prospecting, I should say it was quite as much love of adventure as covetousness of wealth that drew them into unknown parts. For experience shows them only too often that it is not the prospector but the company promoter and financier who make the money even when the prospector finds the gold or diamonds. Yet prospectors go forward as cheerfully as ever. They are fascinated by the life of adventure.