"Ice being a substance consisting of frozen water and without odor, what you say is a contradiction in terms," he pronounced with much solemnity.

"All right, professor," said Ben, with a wink at the boys, "maybe ice ain't as easy to tell as an electric ray, but just the same I'm an old whaling man and I can smell ice as far as you can smell beefsteak frying."

This was touching on the scientist's weak spot, for like many men of eminence, he was nevertheless fond of a good dinner and his alacrity in answering meal calls had become a joke on board.

"You are arguing 'ad hominum,' my dear sir," spoke the professor with dignity. "Ice and beefsteak have no affinity for one another, nor do they partake of the same qualities or analyses."

Whatever Ben might have said to this crushing rejoinder was lost forever, for at this moment there was a great disturbance in the water a short distance from the ship. The boys saw a whale's huge dark form leap from the waves not forty feet from the bow and settle back with a crash that sent the water flying up in the air like a fountain.

"Whale ho!" shouted Ben, greatly excited. "Hullo," he exclaimed the next instant, "now you'll see some fighting worth seeing."

As he spoke, a form dimly seen, so near to the surface was it, rushed through the water and crashed headlong into the whale.

"What is it, another whale?" asked Billy.

"No, it's a monster sword-fish," cried Ben, "and they are going to fight."

The water grew crimson as the sword-fish plunged his cruel weapon into the great whale's side, but the monster itself, maddened by its wound, the next instant charged the sword-fish. Its great jaws opened wide as it rushed at its smaller enemy, for which however, it was no match,—for the sword-fish doubled and swam rapidly away. The next instant it dived, and coming up rammed the whale with its sword once more. With a mighty leap the sea monster mounted clear of the water once more, the blood spouting from its wounds.