"I can't understand it, either—I only know that it's so. They have all our heavy metals in great abundance, and a lot more that we don't know anything about on Earth, but they apparently haven't any light metals at all. It must be that Osnome was thrown off the parent sun late, so that the light metals were all gone?"

"Something like that, possibly."

The extraordinary skill of the Kofedix made the manufacture of the instruments a short task, and after Crane had replaced the few broken instruments of the Skylark from their reserve stock, they turned their attention to the supply of copper that had been gathered. They found it enough for only two bars.

"Is this all we have?" asked Dunark, sharply.

"It is, your Highness," replied the Kolanix. "That is every scrap of metallic copper in the city."

"Oh, well, that'll be enough to last until we can smelt the rest," said Seaton. "With one bar apiece we're ready for anything Mardonale can start. Let 'em come!"

The bars were placed in the containers and both vessels were tried out, each making a perfect performance. Upon the following kokam, immediately after the first meal, the full party from the Earth boarded the Skylark and accompanied the Kofedix to the copper smelter. Dunark himself directed the work of preparing the charges and the molds, though he was continually being interrupted by wireless messages in code and by messengers bearing tidings too important to trust into the air.

"I hope you will excuse all of these delays," said Dunark, after the twentieth interruption, "but...."

"That's all right, Dunark. We know that you're a busy man."

"I can tell you about it, but I wouldn't want to tell many people. With the salt you gave us, I am preparing a power-plant that will enable us to blow Mardonale into...."