"Yes, a lot of them are jumping now. I wonder"
"Look! Look!" cried the man who had been talking to Mr. Damon. "Something out of the ordinary is going on among those porpoises. I never saw them leap out of the water like that before."
"Sharks! It's sharks!" cried a sailor who came running along the deck. "A school of sharks are after the porpoises!"
"I believe he's right," added Mr. Sander, the gentleman with Mr. Damon. "See, there's the ugly snout of one now. He made a bite for that big porpoise but missed."
"Bless my meat axe!" cried the odd man. "So he did. Say, boys, this is worth seeing. There'll be a big fight in a minute."
"Not much of a fight," remarked Mr. Sander. "The porpoise isn't built for fighting. They're trying to get away from the sharks by leaping up."
"Why don't they dive, and so get away?" asked Ned.
"The sharks are too good at diving," went on Mr. Sander. "The porpoises couldn't escape that way. Their only hope is that something will scare the sharks away, otherwise they'll kill until their
