The doctor opened the box, and looked at the wax mask inside it; then handed it to D'Arbino, and replaced the bag of scudi on the table.

"The contents of that box seem certainly to explain a great deal," he said, pushing the bag gently toward Brigida, but always keeping his, hand over it. "The woman who wore the yellow domino was, I presume, of the same height as the late countess?"

"Exactly," said Brigida. "Her eyes were also of the same color as the late countess's; she wore yellow of the same shade as the hangings in the late countess's room, and she had on, under her yellow mask, the colorless wax model of the late countess's face, now in your friend's hand. So much for that part of the secret. Nothing remains now to be cleared up but the mystery of who the lady was. Have the goodness, sir, to push that bag an inch or two nearer my way, and I shall be delighted to tell you."

"Thank you, madam," said the doctor, with a very perceptible change in his manner. "We know who the lady was already."

He moved the bag of scudi while he spoke back to his own side of the table. Brigida's cheeks reddened, and she rose from her seat.

"Am I to understand, sir," she said, haughtily, "that you take advantage of my position here, as a defenseless woman, to cheat me out of the reward?"

"By no means, madam," rejoined the doctor. "We have covenanted to pay the reward to the person who could give us the information we required."

"Well, sir! have I not given you part of it? And am I not prepared to give you the whole?"