"Sure? Of course I am. But why do you ask?"
Ned did not answer for a moment. He glanced at Tom's father, and the young inventor understood. Mr. Swift was getting rather along in age, and his long years of brain work had made him nervous. He had a great fear of Morse and his gang, for they had made much trouble for him in the past. Tom appreciated his chum's hesitancy, and guessed that Ned had something to say that he did not want Mr. Swift to hear.
"Come on up to my room, Ned. I've got something I want to show you," exclaimed Tom, after a pause.
The two lads left the room, Tom glancing apprehensively at his father. But Mr. Swift was so engrossed, together with the aeronaut, in making some calculations regarding wind pressure, that it is doubtful if either of the men were aware that the boys had gone.
"Now what is it, Ned?" demanded our hero, when they were safe in his apartment. "Something's up. I can tell by your manner. What is it?"
"Maybe it's nothing at all," went on his chum. "If I had known, though that those men had gotten out of jail, I would have paid more attention
