“True; but he may have decided to remove the treasure to some other hiding place!”

“Right!” cried Harding, nervously. “I appreciate the danger of procrastination, Mr. Reade. I am ready when you are.”

“But you must first direct us where to find the treasure cave.”

“That I will do, but——”

“What?”

“You cannot go thither with this air-ship.”

“Why?”

“It is buried deep in a dark and unwholesome cavern. The air-ship cannot enter that.”

“That is all right,” said Frank. “We can leave the ship and return to it when we have secured the treasure.”

“Certainly.”