“All of them,” returned Jo, emphatically.

“Well, you will have to get some out of the storeroom,” said the captain, who had been attracted by the discussion. “I think it is likely someone has taken them out and forgotten them.”

“Now, then,” cried Jo, when the other rowlocks had been put in. “Where’s Berwick? Give him a hail, will you?”

At this instant Berwick came up the ladder from the engine room, excitedly swinging an iron bar.

“Hallo,” called Tom. “What have you got there?”

“What do you think of that!” demanded Berwick as he came toward the others.

“What is it?” asked the professor.

“It is an iron bar that I found wedged in the engine,” replied Berwick. “I thought I would take a look over the engine before I went ashore and I found this.”

“What was it doing there?” asked the professor.