He had written but a few lines, when a slight sound at the room window roused his attention. The noise was too trifling to be much heeded; it might have been a passing owl or bat flapping its wing against the wooden shutter. Herrera resumed his writing. A few moments elapsed, and the noise was again heard. This time it was a distinct tapping upon the shutter, very low and cautious, but repeated with a degree of regularity that argued, on the part of the person making it, a desire of attracting his attention. Herrera rose from his seat, and obeying a sort of instinct or impulse, for which he would himself have had trouble to account, masked the lamp behind a piece of furniture, and hastening to the window, which opened inwards, cautiously unlatched it. A man, whose features were unknown to him, was supporting himself on the ledge outside, his legs gathered under him, and nearly the whole of his thin flexible body coiled up within the deep embrasure of the window. Putting his finger to his lips, to enjoin silence, he severed, by one blow of a keen knife, a cord that encircled his waist, and then springing lightly and actively into the room, closed the shutter, since the opening of which, so rapid had been his movements, not ten seconds had elapsed. Although the motive of this strange intrusion was entirely unknown to him, Herrera at once inferred that it boded good rather than evil. He was not long left in doubt. The esquilador pointed to Herrera's wounded arm, the sleeve of which was still cut open, although the wound was healed, and the limb had regained its strength. "Have you full use of that?" said he. "I have," replied Herrera. "But what is your errand here?" "To save you," answered the gipsy. "There is no time for words. We must be doing." And making a sign to Herrera to assist him, he caught hold of one end of the heavy old-fashioned bedstead, which had been allotted to the use of the wounded prisoner, and with the utmost caution to avoid noise, lifted it from the ground and brought it close to the window. Then, taking a rope from his wallet, he fastened it to one of the bed-posts. Herrera began to understand. "And my companions," said he. "They also must be saved. My room door is locked, but the next window is that of their apartment." "It is impossible," said the gipsy. "_You_ may be saved, perhaps; but to attempt the rescue of more would be destruction. Look here." The gipsy extinguished the lamp and, stepping upon the bed, reopened the shutter, and drew Herrera towards him. "Listen," said he, in a low whisper.