The captain immediately reversed engines and put on full speed, but the luminous monster gained on us and played round the frigate with frightful rapidity. Its light would go out suddenly and reappear again on the other side of the vessel. It was clearly too great a risk to attack the thing in the dark, and by midnight it disappeared, dying out like a huge glow-worm. It appeared again, about five miles to the windward, at two in the morning, coming up to the surface as if to breathe, and it seemed as though the air rushed into its huge lungs like steam in the vast cylinders of a 2,000 horse-power engine.

"Hum!" said I. "A whale with the strength of a cavalry regiment would be a pretty whale!"

II.--The Attack and After

Everything was in readiness to attack with the coming of the dawn, and Ned Land was calmly sharpening his great harpoon, but by six in the morning the thing had again disappeared, and a thick sea-fog made it impossible to observe its further movements. At eight o'clock, however, the mist had begun to clear, and then, as suddenly as on the night before, Ned Land's voice was heard calling: "The thing on the port-quarter!"

There it was, surely enough, a mile and a half away, now a large black body showing above the waves, and leaving a track of dazzling white as its great tail beat the water into foam.

Moving rapidly, it approached within twenty feet of the frigate. Ned stood ready at the bow to hurl his harpoon, and the monster was now shining again with that strange light which dazzled our eyes. All at once he threw the harpoon. It struck on a hard body.

Instantly the light went out and two enormous water-spouts fell on our deck. A frightful shock followed, and the next moment I found myself struggling in the sea. Though a good swimmer, I kept afloat with some difficulty, and great was my joy when I heard the voice of the faithful Conseil, who had jumped in after me. Much stronger than myself, he helped me to remove some of my clothes, and thus we kept afloat until I fainted.

When I regained consciousness, I found myself on the top of what seemed to be a floating island, and there was Ned Land as well as Conseil. We were on the back of the mysterious monster, and it was made of metal! Presently it began to move, and we were afraid it might go below the surface.

Indeed, it seemed to be on the point of submerging, when Land hammered loudly on the metal plates, and in a moment an opening was made and the three of us were drawn inside by eight masked men. A door banged on us, and for half an hour we lay in utter darkness. Then a brilliant electric light flooded the cabin, a room of about twenty feet by ten, and two men entered. One was tall, pale, and dark-eyed, but magnificently proportioned.

Though we spoke to them in French, German, English, and Latin, they did not seem to understand, while their own speech was unintelligible to us. But they gave us clothes and food. After eating the food, which was strange but delicious, we all lay down and slept the sleep of sheer exhaustion.