"The one you seek is gone. If, though, you would find him, press that copper nail which you see on the third row of books. You will find the means of his escape into the next house." A cry was heard from the interior of the room. A female voice thus spoke to the man who had just spoken: "Señor Muñez, it is abominable for you thus to betray the poor fellows. You are a bad and heartless man." When the Doctor heard thus revealed the secret of his retreat, he had pushed through the inner door, and it was well he did, for it gave him time to leave the room. The door of the library offered but a feeble resistance, which was soon overcome, and Pignana's house was carefully entered and searched. He at once conceived an idea of a plan of escape. He said to Pignana, "Not a word; but follow me." Von Apsberg, accompanied by Pignana, left the place where they were concealed, went into the yard, and proceeded to a shed which was separated from his house by a few badly joined planks. One of these he removed, passed through the opening, and stood in an outhouse where he remembered he had once made some anatomical inquiries. "But you are going back," said Pignana, "you will again fall in the hands of the enemy." "You would be a bad general, Pignana," said Von Apsberg; "this is a common _ruse de guerre_, and is known as a counter-march. These places have been explored by the enemy, and consequently they will return no more. While the agents are looking where we are not, we will return where they have been."