“Yes, we’ll leave for Philadelphia to-morrow,” was the answer.

“Are we going in the butterfly?  Bless my watch chain, but I like that little machine!”

“It will be some time before you again have a flight in her,” said Tom, sorrowfully, as he told of Andy’s act of vandalism.

“Why, bless my individuality!” cried Mr. Damon, indignantly.  “I never heard of such a thing!  Never!”

It did little good to talk of it, however, and Tom wanted to forget about it.  He wished he had time to repair the monoplane before he left home, but there was much to do to get ready for the trial of the whizzer.

“When will you be back, Tom?” asked Mr. Swift, as his son and Mr. Damon departed for the Quaker City the following morning.

“Hard to say, dad.  If I can make a long flight in the whizzer I’ll do so.  I may even drop down here and pay you a visit.  But if I find there are many more changes to make in her construction, which is more than likely, I can’t say when I’ll return.  I’ll keep you posted, however, by writing.”

“Can’t you arrange to send me some wireless messages?” asked the older inventor, with a smile.

“I could, if I had thought to rig up the apparatus on Mr. Fenwick’s airship,” was the reply.  “I’ll hardly have time to do it now, though.”

“Send wireless messages from an aeroplane?” gasped Mr. Damon.  “Bless my gizzard!  I never heard of such a thing!”

“Oh, it can be done,” Tom assured him.  And this was a fact.  Tom had installed a wireless apparatus on his Red cloud recently, and it is well known that several of the modern biplanes can send wireless messages.  The crossing and bracing wires of the frame are used for sending wires, and in place of ground conductors there are trailers which hang below the aeroplane.  The current is derived directly from the engine, and the remaining things needed are a small step-up transformer, a key and a few other small parts.  Tom had gone a step farther than this, and had also arranged to receive wireless messages, though few modern aeroplanes are thus equipped as yet.

But, of course, there was no time now to install a wireless apparatus on Mr. Fenwick’s craft.  Tom thought he would be lucky if he got the whizzer to make even a short flight.

“Well, let me hear from you when you can,” requested Mr. Swift, and Tom promised.  It was some time after that, and many strange things happened before Tom Swift again communicated with his father, at any length.

The young inventor had bidden farewell to Miss Nestor the night previous.  She stated that she had a message that day from her parents aboard the resolute, which spoke a passing steamer.  Mr. and Mrs. Nestor, and the other guests of Mr. Hosbrook were well, and anticipated a fine time on reaching the West Indies.

Tom now said good-by to his father, the housekeeper and Mr. Jackson, not forgetting, of course, Eradicate Sampson.