Chapter 21 DIRIGIBLE VS. AEROPLANE.

A galvanic shock passed through the boy at the discovery, and he silently crawled to where Harry and Ben lay and placing his hand over their mouths he in turn awoke them.

"Don't utter a word," he whispered, "Luther Barr's air-ship is here."

From the spot in which they crouched, keeping as closely in the shadow of the stout mast as they were a