“I believe we are to be conducted to the palace of your king to-morrow,” ventured the Englishman to the boy. The boy shook his head, but made no reply, and busied himself with removing the dishes. As they were rising from the table, they heard footsteps in the hall outside. The door opened. It was Captain Tradmos, and he was accompanied by a tall, bearded man with a leather case under his arm. “You must undergo a medical examination,” the captain said smilingly. “It is our invariable custom, but this is by a special order from the king.” Johnston shuddered as he looked at the odd-looking instruments the medical man was taking from the case, but Thorndyke watched his movements with phlegmatic indifference. He stood erect; threw back his shoulders; expanded his massive chest and struck it with his clenched fist in pantomimic boastfulness. Tradmos smiled genially; but there was something curt and official in his tone when he next spoke that took the Englishman slightly aback. “You must bare your breast over your heart and lungs,” he said; and while Thorndyke was unbuttoning his shirt, he and the medical man went to the door and brought into the room a great golden bell hanging in a metallic frame. The bell was so thin and sensitive to the slightest jar or movement that, although it had been handled with extreme care, the captives could see that it was vibrating considerably, and the room was filled with a low metallic sound that not only affected the ear of the hearer but set every nerve to tingling. The medical man stopped the sound by laying his hand upon the bell. To a tube in the top of the bell he fastened one end of a rubber pipe; the other end was finished with a silver device shaped like the mouth-piece of a speaking tube. This he firmly pressed over the Englishman's heart. Thorndyke winced and bit his lip, for the strange thing took hold of his flesh with the tenacity of a powerful suction-pump. “Ouch!” he exclaimed playfully, but Johnston saw that he had turned pale, and that his face was drawn as if from pain. “Hold still!” ordered the medical man; “it will be over in a minute; now, be perfectly quiet and listen to the bell!” The Englishman stood motionless, the sinews of his neck drawn and knotted, his eyes starting from their sockets. Thorndyke felt the rubber tube quiver suddenly and writhe with the slow energy of a dying snake, and then from the quivering bell came a low, gurgling sound like a stream of water being forced backward and forward. Tradmos and the medical man stepped to the bell and inspected a small dial on its top. “What was that?” gasped the Englishman, purple in the face. “The sound of your blood,” answered Tradmos, as he removed the instrument from Thorndyke's flesh; “it is as regular as mine; you are very lucky; you are slightly fatigued, but you will be sound in a day or two.” “Thank you,” replied the Englishman, but he sank into a chair, overcome with weakness.