"That's all right," grinned Bob. "I'll get one of those thirty-thirties out of the rack and slip her into the boat. Maybe we won't use it, and maybe we will. We might meet that Pirate Shark, you know!"

"Oh, shucks!" ejaculated Mart.

They breakfasted early the next morning, and as the captain wanted a message relayed to San Francisco, the boys sought the wireless house while Dailey and Borden and Yorke were getting a boat over the side. After some persistent efforts, Mart finally raised an answer, and after looking it up in his blue-bound book, found that it came from a Dutch steamer of the Nederland line, and promptly got rid of his messages, which would be relayed by more powerful instruments to Manila and Honolulu. During this labor, Bob slipped away, and after Mart had reported to Captain Hollinger and secured his motion-picture camera, he found his chum waiting in the boat, where Dailey and Yorke, Borden and Birch were at the oars. Waving farewell to the ship, they moved away; Bob nudged Mart and pointed to a tarpaulin under the stern.

"There she is," he said mysteriously.

"What?"

"That rifle," reported Bob, chuckling. "We're off, old scout! I wish we'd meet that Pirate Shark o' Jerry's. I guess a thirty-thirty bullet would make him sick!"

"Huh!" grunted Mart, his eyes sweeping across the sunlit waters. "No chance!"


CHAPTER IX

THE BLACK FIN