"I forget the name of the place," came the reply. "I can't think clearly. I need sleep." The newcomer kept in the shadows of the room, as if the light hurt his eyes, and appeared restless and ill at ease. With the hand that was not in a sling he pulled the bandages closer about his face. "Can't you tell us more about what happened?" asked Jack, for Mark was not usually so reticent, and his chum noticed it. "There isn't much to tell," was the response. "I went to the old house, and I was looking around when I happened to tumble down stairs. I must have been knocked unconscious, but when I came to I crawled outside. A farmer was driving past, and I asked him to take me to a hospital." "Why didn't you come home?" asked Mr. Henderson. "Oh, I didn't want to make any trouble and delay work on the projectile. I figured that I could be with you in a few hours, and you wouldn't worry. But they insisted that I must stay in the hospital when they got me there. Then I lost consciousness again, and couldn't manage to let you know where I was. But I'm all right now." "Why didn't you wait for me at the barn, when I went to send the telegram, as you promised you would?" asked Jack, who felt a little hurt at his chum's neglect. "Did I promise to wait for you at some barn?" "Yes; don't you remember?" and Jack gazed at the bandaged figure in surprise. "Oh, yes--I--I guess I do. But I want to go to bed now," and pulling the cloths closer about his face the injured one started from the apartment. "Here. That's not the way up to your room. The stairs are over here," called Jack, for he saw the newcomer taking the wrong direction. "Oh, yes. Guess my mind must be wandering," and with an uneasy laugh the injured one turned about. They heard him going up stairs, and a little later Jack followed. He found that Mark's room was not occupied. "Hi, Mark! Where are you?" he called, in some alarm. "Here," was the answer, and the voice came from Jack's own apartment. "Well, you're in the wrong bunk." "Am I? Well, I must have made another mistake. My head can't be right," and with that the other came out and hastily went into the adjoining apartment. For a moment Jack stood in the hall. He looked at the door that had closed behind the bandaged figure. "There's something wrong," said Jack in a low voice. "How strange Mark acts! I wonder what can be the matter?" CHAPTER XI READY FOR THE MOON There were busy times for the moon-voyagers the next day. They were up early, for at the last moment many little details needed to be settled. The Cardite motor had been thoroughly repaired, for the damage caused by the unknown enemy had done no permanent harm. When the injured one appeared the bandage on his head seemed larger than ever, and his features were almost hidden. He still wore his arm in a sling. "Well, how do you feel?" asked Jack, looking narrowly at the figure. He could not get rid of a suspicion that something was wrong with Mark.