"Those braziers and cooking pots," he had said, "and the tools that must have been needed to build the steps and to dig their graves, prove that they know how to work in iron. If it is not done in these caverns, then they get it from some other similar community. But I think it likely that we shall come upon some signs of the work hereabouts." "Maybe they import it from Pittsburg," was the remark that fun-loving Jack could not refrain from making. "Well, you'll see," said Edmund. And, as I have already told you, he was right. We did find the smithy, with several stout fellows pounding out rude tools with equally rude hammers of iron. Of course we could ask them no questions, for their language was only a kind of squeak, and they seemed to converse mostly by means of expressive signs. But Edmund was not long in drawing his conclusions. "This," he said, after closely examining the metal, "is native iron. There's nothing remarkable in the fact that it should be here. All the solid planets, as you know" (turning to me), "are very largely composed of iron, and Venus, being nearer the center of the system, may have proportionally more of it than the earth. And these fellows have found out its usefulness, and how to work it. There's nothing surprising in that, either, for some of our savages have done as much on the earth. Now I'll make another prediction--we are going to find coal here. That is inevitable, since we know that they burn it in the caverns. I shouldn't wonder if it were close at hand, from the look of these rocks." He approached the wall of the cavern containing the smithy, and immediately exclaimed: "Look here! Here it is!" And sure enough, on joining him we saw a seam of as fine anthracite as Pennsylvania ever produced. "A Carboniferous Age on Venus!" Edmund continued. "What do you think of that? But, of course, it was sure to be so; all the planets that are old enough have been through practically the same stages. Think of it! The plants that gave origin to this coal must have flourished here when Venus still rotated on her axis rapidly enough to have day and night succeeding one another on all sides of her, for now no vegetation except the insignificant plants that grow in these caverns can live on this hemisphere. And think, too, of the countless ages that must have been consumed in slowing down her rotation by the friction of her ocean tides." "Has Venus got any oceans?" asked Jack. "I haven't a doubt of it; but we shall find none on this side, although they must once have been here." We all mused for a time on the subject that Edmund had started, when suddenly his face lighted up with the greatest animation, and he exclaimed, but as if speaking to himself rather than to us: "Capital! It couldn't have happened better!" "What's capital?" drawled Jack.