in the selenium plates.

Then Tom felt the mirror bobbing up and down like a motor boat in
a storm. He felt the vibration, and he heard a voice calling in
his ear:

"Get up, Tom! Get up!"

"Yes! What is it?" he sleepily exclaimed,

"Hush!" was the caution he heard, and then he realized that his
dream had been caused by Ned shaking him.

"Well?" whispered Tom, in tense tones.

"Midnight visitors!" answered his chum "The burglar alarm has just
gone off! The airship hangar drop fell. Koku has gone out. Come
on!"





CHAPTER XI

THE AIRSHIP IS TAKEN


Tom leaped silently out of bed, and stood for a moment half
dazed, so soundly had he been sleeping.