He felt for his penknife to scrape out the bread from the case, then remembered that his jailer had removed it. What was he to do? Feeling by force of habit in his waistcoat pocket, he came upon a little hole in the lining, and pushing his finger through, he touched a single lucifer match that had found its way down. He enlarged the hole, took out the match, and began to prise the caked flour bit by bit from the cartridge-case. He was, glad of any little activity that would enable him to kill time. Soon a little heap of crumbs lay on the sill of the window-recess. Then, drawing the match once more from the case, he saw that this time it had impaled, not a crumb, but a piece of some white fluffy substance. "What is this?" he thought, and with growing curiosity inserted the match again. More fluff came out; it appeared to be cotton wool. "Very odd!" he mused. He wetted the end of the match and inserted it again. A little more of the wool adhered, but the next time the match came out bare. He pushed it in again; but though he held it with the extreme tips of his fingers, it touched nothing. "Empty at last, I suppose. Yet it didn’t touch the bottom of the case. I wonder if it is empty." He turned his back on the window and held the case up so that the light fell into it. But it was too narrow for him to see anything, supposing anything were there. He held it vertically, and shook it. Something fell from it, and rolled across the floor of the room. It was like a pea. Bob stooped and picked it up. It was a pea—no, it was a small pellet of paper! Quick as thought Bob slipped it into his pocket, glancing instinctively towards the door and then to the opening in the wall. There was no one to see him. He smiled and took the pellet from his pocket. Unrolling it with infinite care, he found that it was a slip of very thin rice-paper, and on it—yes, in small letters, faintly traced in Indian ink, he saw the words: "_Be at window above river at dusk to-night._" That was all; there was no address, no signature. Yet, looking again at the writing, Bob felt that he had seen it somewhere before. Where? He could not remember, and as he stood trying to recall, he heard the heavy tread of his jailer in the passage outside. Instantly he slipped the paper into his pocket, flung the cartridge-case far out into the river, and was walking up and down when the soldier threw open the door and entered with his second meal.