He rushed from the deck, while the captain, with a grim look on his face, glanced at Bob, who burst into laughter.

CHAPTER XIV

MR. TARBILL GETS A SHOCK

"This is one of your 'jokes,' I suppose," remarked the captain.

"Yes. It was too funny," answered Bob. "He really believed a whale was after us."

"Do you think it was a good thing to do, alarm him so?"

"I—er—well, I thought it might do his nerves good," stammered Bob.

"Hum!" murmured the captain. "I must say, Bob, you have a queer idea of what is good for the nerves. Now I can't allow this. Mr. Tarbill is a guest of mine, and I will not have his comfort interfered with. He is taking a voyage for his health, and I don't want him annoyed."

"I'm sorry," began Bob, always ready to repent, though usually it did not last long.

"Then don't do it again."