"It will be something else to put in the book I am to write," said Mr. Henderson. "But, now that we have evidence of former life on the moon, we must investigate further. We will make an attempt to go to the other side of the country, and to that end I suggest that we set our projectile in motion and travel a bit. There is little more to see here." This plan met with general approval, and, after some photographs had been taken of the petrified man, and the professors had made notes, and set down data regarding him, and had tried to guess how long he had been dead, they went back to the _Annihilator_. "Well, did yo' all see him?" asked Washington. "We sure did," answered Jack. "You weren't mistaken that time." They got ready to move the projectile, but decided to remain over night where they were. "Over night" being the way they spoke of it, though, as I have said, there was perpetual daylight for fourteen days at a time on the moon. Professors Roumann and Henderson made a few more observations for scientific purposes. They found traces of some vegetation, but it was of little value for food, even to the lower forms of animal life, they decided. There was also a little moisture; noticed at certain hours of the day. But, in the main, the place where they had landed was most desolate. "I hope we get to a better place soon," said Jack, just before they sealed themselves up in the projectile to travel to a new spot. As distance was comparatively small on the moon, for her diameter is only a little over two thousand miles and the circumference only about six thousand six hundred miles, the _Annihilator_ could not be speeded up. If it went too fast, it would soon be off the moon and into space again. Accordingly the Cardite motor was geared to send the big craft along at about forty miles an hour, and at times they went even slower than that, when they were passing over some part of the surface which the professors wished to photograph or observe closely. They did not rise high into the air, but flew along at an elevation of about two hundred feet, steering in and out to avoid the towering peaks scattered here and there. Occasionally they found themselves over immense craters that seemed to have no bottom. For two days they moved here and there, finding no further signs of life, neither petrified nor natural, though they saw many strange sights, and some valuable pictures and scientific data was obtained. It was on the third day, when they were approaching the side of the moon which from time immemorial has been hidden from view of the inhabitants of the earth, that Jack, who was with Mark in the engine room, while the two professors were in the pilot-house, remarked to his chum: "Mark, doesn't it strike you that the water pump and the air apparatus aren't working just right?" "They don't seem to be operating very smoothly," admitted Mark, after an examination.