“Now we’ll start the engine and see how we will come out,” the inventor exclaimed, as he wiped his hands on some waste. It did not take long to generate enough power to turn the dynamo. Soon the familiar hum and whirr was heard, and, a few seconds later the filaments in the lamps began to glow a dull red, which gradually brightened until they were shining in all their usual brilliancy. “Hurrah!” cried the boys. “Now we can see!” They all felt in better spirits with the restoration of the lights, and, washing off the grease and dirt of their labors in the engine room, they prepared to sit down to the meal which Washington prepared. As soon as the dynamo was working well, care had to be taken not to speed it too much on account of a mended belt. The professor turned off part of the lights and switched some of the current into the storage batteries, to provide for emergencies. For there was no telling how long the night might last. Jack was the first one to finish the meal—they did not know whether to call it dinner, supper or breakfast. He went into the conning tower, and, as soon as he reached it he called out: “Come on up here, professor! There’s something strange going on!” Mr. Henderson, followed by Mark, hurried to the tower. As he reached it and looked out of the forward window, a beautiful white glow illuminated the whole scene, and then, from below the horizon, there arose seven luminous disks. One was in the centre, while about it circled the other six, like some immense pin-wheel. “It’s the moon!” cried Mark. “It’s seven moons!” Jack exclaimed. “Why it’s almost as light as day!” And so it was, for the seven moons, if that is what they were, gave an illumination not unlike the sun in brilliancy though it was like the beams from the pale moon of the earth. “I guess we need not have worried about the darkness,” the professor remarked. “Still it is a good thing I fixed the dynamo.” For some time he and the other adventurers watched the odd sight of the moons, as they rose higher and higher overhead. The scene was a beautiful, if weird one, for the whole plain was bathed in the soft light. “I guess we can turn off the incandescents, and use all the power for the storage batteries,” Mr. Henderson went on, as he descended into the ship, and opened the port shutters which had been closed when they started off on their exploring tour. The interior of the _Mermaid_ was almost as light as when the odd colored beams had been playing over the new earth to which they had come. “I think we had better continue with our work of making repairs,” Mr. Henderson said. “We can’t count on these moons remaining here any length of time, and I want to take advantage of them. So though some of us perhaps need sleep, we will forego it and fix up the _Mermaid_. I want to take a trip and see what other wonders await us.”