“I know it.”

The concierge looked upon the count with surprise.

“Sir,” he cried, scarcely able to believe his good fortune—“sir, I cannot understand your generosity!”

“Oh, it is very simple, my good fellow; I have been a sailor, and your story touched me more than it would others.”

“Then, sir, since you are so liberal, I ought to offer you something.”

“What have you to offer to me, my friend? Shells? Straw-work? Thank you!”

“No, sir, neither of those; something connected with this story.”

“Really? What is it?”

“Listen,” said the guide; “I said to myself, ‘Something is always left in a cell inhabited by one prisoner for fifteen years,’ so I began to sound the wall.”