The silver whale was floating lazily in a growth of submarine plants not a quarter of a mile distant. It did not seem conscious of the approach of the Dolphin.

Frank was in the pilot-house.

The young inventor instantly brought the Dolphin to a stop. He had decided this time upon more cautious tactics.

He was determined to make sure of his game this time.

He allowed the Dolphin to float gradually nearer to the monster.

Stanhope was with him in the pilot-house.

The explorer watched Frank’s tactics with great eagerness.

“You have given up the idea of trying to run down and ram the whale?” he asked.

“Yes,” replied Frank. “I am going to try a different game.”

“Torpedoes?”