ing about, eluding the efforts of the ship's officers and crew to capture it. And it seemed only a question of time when the muzzle would tear loose, too. Then, free on deck, the giant cannon would roll through the frail bulwarks, and plunge into the depths of the sea,
"Look out for yourselves, boys!" cried tHe officer, as he saw Tom and Ned. "This is no plaything!"
"I know it!" gasped Tom. "But we've got to fasten it down."
"That's what we're trying to do," answered the other. "We did get the bight of a cable over the breech, but the men could not hold it, even though they took a couple of turns around the bitts."
"Ned, go call Koku!" cried Tom. "We need him up here."
"That's right!" declared his chum. "If anyone can hold the cable with the weight of the big gun straining on it, the giant can. I'll get him!"
"On deck, Koku, quick!" gasped Ned "Master's cannon may fall into the sea."
"But the powder!" asked the big man, simply. "Master told me to guard the powder. I stay here."
"No, I'll stay!" insisted Ned. "You are needed on deck, I'll take your place here."
