In a month they were able to carry on light conversation, and from then on mastery of the language was faster. The women far surpassed the men, due to desire for entertainment. When he was able to question the crew, Dick received a terrible shock. _They knew less about the ship's operation than his own men!_ They didn't understand their own equipment! The people of the domes were content to enjoy the mechanical wonders of their ancestors--without bothering about how they ran. They used equipment for every purpose, without the slightest interest in why it worked. The earthmen suddenly realized what a gigantic task they faced. _Seven men_--to rebuild a civilization! The men at the controls knew what reaction would take place by movement of a lever, but _didn't understand why_! Dick became slightly worried about reaching their destination--it was beyond all reason. Earthmen wouldn't have attempted to operate equipment they knew nothing about, by movement of controls to obtain the proper action. It was no wonder these people had found it necessary to find engineers to run their machines! Months slipped by as the ship moved steadily toward the giant planet. Every piece of equipment seemed to be the answer to perfection. This voyage had taught them more about mechanics than was covered in a complete engineering course on earth. It was of a far different kind, with gravity the basis of all operation. Even the space ship employed some of the same power, drawn from the nearest heavy body, then amplified until it reached enormous proportions.[1] Peter Yarbro was a practical chemist, and spent many hours trying to analyze the fuel. It was highly inflammable, yet could stand terrific compression without effect. When it was allowed to expand again, it reached the flash point immediately, creating enormous amounts of heavy gas. He believed it might be duplicated from crude oil, properly refined. When Dick learned that there was a history of the space ship, in the metal books, his curiosity was aroused. He could read the language of the domes slightly, but not enough to study the intricate explanations. It was through these books that the dome men had learned to control the ship, and set the course for any desired planet. Morquil's aid was enlisted, to translate the text, and he learned some amazing facts. A description of the fuel was given, but the base for manufacture was unknown, being of natural origin on Jupiter. As Morquil read farther and explained sections that Dick couldn't understand, the earthman felt uneasy. The crew had abandoned all hope of returning to their home planet, the first time they started from the earth. They didn't understand what it meant to feel responsible for equipment. They manufactured enough fuel for two trips, according to the rating of consumption in the books--but Dick wondered?