"The fact that the vegetation is growing thicker. There are many more plants below us now than there were before. This part of the moon is better able to support life than the portion we have just come from."
This seemed to be so, but they were still some distance from the opposite side of the moon.
"I don't see anything of those diamonds you talked so much about,
Jack," said Mark, with a smile, a little later. "I guess all the
Reonaris you get you can put in a hollow tooth."
"You wait," was all Jack replied.
The projectile was slowed up to permit the two professors to make some notes regarding a particularly large and deep crater, and a few minutes later when Mark, who was in the engine room, attempted to speed up the Cordite motor it would not respond.
"Humph! I wonder what's wrong?" he asked of Jack.
"Better call Mr. Roumann, and not try to fix it yourself," suggested his chum, when, in response to various movements of the lever, the machine seemed to go slower and slower.
The German came in answer to the summons.
"Ha!" he exclaimed, "that motor is broken again. We shall have to stop once more for repairs. I shall need to take it all apart, I fear. Get me the negative plate remover, will you, Mark?"
The lad went to the tool chest for it. He opened the lid and fumbled about inside.