In the midst of the uproar, however, there came a sudden and dead silence.

Other monsters were approaching, leading to the scene a monster larger than the rest. It was the king of the submarine demons.

At the approach of the king all the others fell back.

The king advanced, with eyes as staring as his followers, but with a tail that was motionless.

Ten feet from Amos Fearless and Dave he halted.

For a moment nothing was done upon either side.

Evidently the king of the demons was calculating the best manner of attacking the strange objects which had appeared in his realm.

He had seen the dead bodies of human beings, but never had he beheld live human beings, with skins of steel and rubber.

At last he came up cautiously and put out one long and bony hand towards Dave.

The movement was so slow that Dave was filled more with curiosity than with fear.