bedroom, took the key from the lock, and, holding it in his hand, said: "Come here, Fanferlot, and stand by my side: there; very well. Now suppose that I want to open this door, and you don't want me to open it; when you see me about to insert the key, what would be your first impulse?""To put my hands on your arm, and draw it toward me so as to prevent your introducing the key."

"Precisely so. Now let us try it; go on." Fanferlot obeyed; and the key held by M. Lecoq, pulled aside from the lock, slipped along the door, and traced upon it a diagonal scratch, from top to bottom, the exact reproduction of the one in the photograph.

"Oh, oh, oh!" exclaimed Fanferlot in three different tones of admiration, as he stood gazing in a revery at the door.

"Do you begin to understand now?" asked M. Lecoq.

"Understand, patron? Why, a child could understand it now. Ah, what a man you are! I see the scene as if I had been present. Two persons were present at the robbery; one wished to take the money, the other wished to prevent its being taken. That is clear, that is certain."

Accustomed to triumphs of this sort, M. Lecoq was much amused at Fanferlot's enthusiasm.

"There you go off, half-primed again," he said, good-humoredly: "you regard as sure proof a circumstance which may be accidental, and at the most only probable."

"No, patron, no! a man like you could not be mistaken: doubt no longer exists."

"That being the case, what deductions would you draw from our discovery?"

"In the first place, it proves that I am correct in thinking the cashier innocent."

"How so?"

"Because, at perfect liberty to open the safe whenever he wished to do so, it is not likely that he would have brought a witness when he intended to commit the theft."

"Well reasoned, Fanferlot. But on this supposition the banker would be equally innocent: reflect a little."

Fanferlot reflected, and all of his animation vanished.

"You are right," he said in a despairing tone. "What can be done now?"

"Look for the third rogue, or rather the real rogue, the one who opened the safe, and stole the notes, 

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