"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."