"Impossible? Ever a foolish word, Master. You know that the brain has always been my special study. As much as ten years ago, I was universally recognized as the greatest expert in my specialty. But I tell you that my knowledge of the subject was as nothing then to what it is now. I have been very busy these last ten years. Look!" With a graceful sweep of a hand he indicated the four coolie-guards and his four white-smocked assistants. "These men of mine," he continued, "do they appear normal, would you say? Or, rather, mechanicalized; lacking in certain things and thereby gaining enormously in the values which can make them perfect servitors? I have removed from their minds certain superficial qualities of thought. The four men in white were, a few years ago, highly skilled surgeons, three of them brain specialists and noted for exceptional intellects and bold, pioneering thinking. I needed them and took them, diverting them from their natural state, in which they would have resisted me and refused my commands. Certain complicated adjustments on their brains--and now their brains are mine, all their separate skill at my command alone!" * * * * * Leithgow sat back suddenly, astonishment and horror on his face. His lips parted as if to speak, then closed tightly together again. At last he uttered one word. "Murderer!" Dr. Ku smiled. "In a sense, yes. But let me go on. "The reshaping of these mentalities and of the mentalities of all my coolies, were achievements, and valuable ones; but I wanted more. I wanted much more. I wanted the great, important part of all Earth's scientific knowledge at my fingertips, under my control. I wanted the exceptional brains of Earth, the brains of rare genius, the brains that lived like lonely stars, infinitely removed from the common herd. And more than that, I wanted them _always_; I wanted them _ageless_. For I had to seal my power!" The Eurasian's words were coming more rapidly now, though the man's thoughts and tone were still under control; and Carse, sitting there silently, felt that the climax was being reached; that soon something unthinkable, something of dread, would be revealed. The voice went on: "These brains I wanted were not many--only six in all. Most of them you knew, Master Leithgow, these men who constituted the cream of Earth's scientific ability. Professor Estapp, the good-looking young American; Dr. Swanson, the Swede; Master Scientist Cram--the great English genius Cram, already legendary, the only other of that rank beside yourself; Professor Geinst, the hunchbacked, mysterious German; and Dr. Norman--Dr. Sir Charles Esme Norman, to give him his English title. I wanted these men, and I got them! All except you, the sixth!" * * * * * Again Dr. Ku Sui smiled in triumph. To Eliot Leithgow his smile was unspeakable. "Yes," the elderly scientist cried out, "you got them, you murderer!"