“There goes that blamed sunlight again,” exclaimed Johnston, grasping his companion's arm, “don't you see it changing?” “Yes, and this time it is white, like old Sol's natural smile; but isn't it clear? It seems to me that I could see to the end of the earth in that light. I want to know how he does it.” “How who does it?” “Why, the king, of course, it is his work--some sort of invention; but we must keep civil tongues in our heads when we are dealing with a man who can color the very light of the sun.” They were walking back toward the great rotunda, and, as they entered the conservatory, the crowds of men and women stared at them curiously. They had paused to inspect the statue of a massive stone dragon when a young officer in glittering uniform approached and addressed Johnston. “Follow me,” he said simply; “it is the king's command.” The American started and looked at Thorndyke apprehensively. “Go,” said the latter; “don't hesitate an instant.” Poor Johnston had turned white. He held out his hand to Thorndyke, “Shake,” he said in a whisper, not intended for the ears of the officer, “I don't believe that we shall meet again. I felt that we were to be parted ever since that medical examination.” Thorndyke's face had altered; an angry flush came in his face and his eyes flashed, but with an effort he controlled himself. “Tut, tut, don't be silly. I shall wait for you round here; if there is any foul play I shall make some one suffer for it. You can depend on me to the end; we are hand in hand in this adventure, old man.” Chapter VII. Johnston followed his guide to a flying machine outside. He hesitated an instant, as the officer was holding the door open, and looked back toward the conservatory; but he could not see Thorndyke. “Where are you taking me?” he asked desperately. But the officer did not seem to hear the question. He was motioning to a tall man of athletic build who wore a dark blue uniform and who came hastily forward and pushed the American into the machine. Through the open door Johnston saw Thorndyke's anxious face as the Englishman emerged from the conservatory and strode toward them. The two officers entered and closed the glass door. Then the machine rose and Johnston's spirits sank as they shot upward and floated easily over the humming crowd into the free white light above the smokeless city. The poor captive leaned on the window-sill and looked out. There was no breeze, and no current of air except that caused by their rapid passage through the atmosphere. Up, up, they went, till the city seemed a blur of mingled white and gray, and then the color below changed to a vague blue as they flew over the fields of the open country. The first officer took a glass and a decanter from a receptacle under a seat, and, pouring a little red fluid into the glass, offered it to the American. “Drink it,” he said, “it will put you to sleep for a time.” “I don't want to be drugged.”