"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