An examination revealed the fact that the cartridges were not of the same calibre. It was, indeed, a terrible disappointment.

"Here it is," said Alfred, as he slipped into the door of the room.

"Ah, this is a different size; you have the right ones, fortunately," said the captain.

"Now, let me give you a few words as to the next,——"

A pronounced lurch in the vessel's position interrupted the captain. The seamen were now rushing around frantically, and talking excitedly.

"Hold your tongues!" shouted the sub-lieutenant.

The vessel was, evidently, moving. Occasionally, there would be a heavy, rasping sound, and the rear end of the boat would seem to settle down a few feet.

"It's coming all right," said Ralph in excitement.

"Connect forward motor!" again shouted the sub-lieutenant.

The motor turned smoothly without producing a disturbing influence on the ship, indicating that the propeller was still in the air.