This plan was voted a good one, and the Mermaid after having been steered directly over the ruined temple, was brought to a halt, and enough gas let out so that it fell to about fifty feet in the air above it.

The adventurers began their watch. The afternoon waned and there were no signs of any beasts in or about the temple.

“I reckon we can take a chance,” said Andy, who was anxious to get his hands on some diamonds.

“Better wait until morning,” counseled Mr. Henderson. “It will soon be dark, and it doesn’t look like a nice place to go stumbling about in by moonlight.”

So, though all but the scientist were anxious, they had to wait until the night had passed. Several times Washington got up to see if the temple had, by any chance, taken wings during the long hours of darkness, but each time he found it was still in place.

“Seems laik it’ll never come mornin’,” he said.

But dawn came at length, and, after a hasty breakfast, preparations to enter the temple were made. Andy loaded his gun for “bear” as he expressed it, and the boys each took a revolver.

The ship was lowered to as level a place as could be found, and then, seeing that everything was in readiness for a quick departure, the professor led the way out of the Mermaid.

The entrance to the temple was through a big arched gateway. Some of the stones had fallen down, and the whole structure looked as if it might topple over at any moment.

“Go carefully,” cautioned Mr. Henderson. “Watch on all sides and up above. Better let Andy and me go ahead.”