ot aware of her son's meanness, and Tom did not tell her.

Mr. Damon arrived from his home in Waterfield that day, and, with
many "blessings," wanted to know if Tom was ready for the trial of
the electrical airship.

"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 y