"Of course, I'm likely to have made an error, for it isn't easy to translate this stuff." And Jack gazed intently at the strangely printed page, which was covered with characters not unlike Greek. "I may be wrong," went on the lad, "but you must remember that I translated some other articles in this paper, and Professor Henderson also translated them substantially as I did, and Professor Roumann agreed with him. There _is_ Reonaris on the moon, and I wish we could go there and get some." "But maybe after you got the Reonaris it would turn out to be only common crystals," objected Mark. "No!" exclaimed Jack. "Reonaris is what the Martians call it in their language, and that means diamonds. I'm sure of it!" "Well, I don't agree with you," declared the other lad. "Don't be cranky and contrary," begged Jack. "I'm not; but what's the use of believing anything so wild and weird as that? It's a crazy yarn!" "It's nothing of the sort! There are diamonds on the moon; and I can prove it!" "Well, don't get excited," suggested Mark calmly. "I don't believe it; that's all. You're mistaken about what Reonaris is; that's what you are." "I am not!" Jack had arisen from his chair, and seemed much elated. In his hand he held clinched the paper which had caused the lively discussion. It was as near to a disagreement as Jack Darrow and Mark Sampson had come in some time. "Sit down," begged Mark. "I'll not!" retorted Jack. "I'm going to prove to you that I'm right." "How are you going to do it?" "I'm going to get Professor Henderson and Professor Roumann to translate this article for you, and then you can ask them what Reonaris is. Guess that'll convince you; won't it?" "Maybe; but why don't you ask Andy Sudds or Washington White to give their opinion?" "Don't get funny," advised the other lad sharply, and then, seeing that his chum was smiling, Jack laughed, cooled down a bit, looked at the paper which he had crumpled in his hand, and said: "I guess I _was_ getting a little too excited. But I'm sure I'm right. Here's the paper I brought from Mars to prove it, and the only thing there's any doubt about is whether or not Reonaris means diamonds. I'll ask----" At that moment the door of the library, in which Jack and Mark were seated, was cautiously opened, and a black, woolly head was thrust in. Then two widely-opened eyes gazed at the boys. "What's the matter, Washington?" asked Jack, with a laugh. "'Scuse me, Massa Jack," answered the colored man, "but did I done heah you' to promulgate some conversationess regarding de transmigatorability ob diamonds?" "Do you mean, were we talking about diamonds?" inquired Mark. "Dat's what I done said, Massa Mark." "No, you _didn't_ say it, but you meant it, I guess," went on Jack. "Yes, we _were_ talking about diamonds, Washington. I know a place that's full of them."