"All ready," said the doctor, putting his head in at the door of his office and again disappearing. Madeline instantly rose. Henry put his hand on her arm, and said-- "Remember, dear, this was your idea, not mine, and if the experiment fails that makes no difference to me." She bowed her head without replying, and they went into the office. Madeline, trembling and deadly pale, sat down in the operating chair, and her head was immovably secured by padded clamps. She closed her eyes and put her hand in Henry's. "Now," said the doctor to her, "fix your attention on the class of memories which you wish destroyed; the electric current more readily follows the fibres which are being excited by the present passage of nervous force. Touch my arm when you find your thoughts somewhat concentrated." In a few moments she pressed the doctor's arm, and instantly the murmurous, bubbling hum of the battery began. She, clasped Henry's hand a little firmer, but made no other sign. The noise stopped. The doctor was removing the clamps. She opened her eyes and closed them again drowsily. "Oh, I'm so sleepy." "You shall lie down and take a nap," said the doctor. There was a little retiring-room connected with the office where there was a sofa. No sooner had she laid her head on the pillow than she fell asleep. The doctor and Henry remained in the operating office, the door into the retiring-room being just ajar, so that they could hear her when she awoke. CHAPTER XI. "How long will she sleep, doctor?" asked Henry, after satisfying himself by looking through the crack of the door that she was actually asleep. "Patients do not usually wake under an hour or two," replied the doctor. "She was very drowsy, and that is a good sign. I think we may have the best hopes of the result of the operation." Henry walked restlessly to and fro. After Dr. Heidenhoff had regarded him a few moments, he said-- "You are nervous, sir. There is quite a time to wait, and it is better to remain as calm as possible, for, in the event of an unsatisfactory result, your friend will need soothing, and you will scarcely be equal to that if you are yourself excited. I have some very fair cigars here. Do me the honour to try one. I prescribe it medicinally. Your nerves need quieting;" and he extended his cigar-case to the young man. As Henry with a nod of acknowledgment took a cigar and lit it, and resumed his striding to and fro, the doctor, who had seated himself comfortably, began to talk, apparently with the kindly intent of diverting the other's mind.