"Dr. Bird!" gasped Carnes in tones of relief. "Are you all right?" "Right as can be. I learned a lot this afternoon. For one thing, you're going to start flying lessons to-morrow and you're going to do your best to become an expert pilot in a short time. It is the only thing to do." "And fly a plane for Saranoff?" "I hope not. The only way to avoid that very thing is to keep your mentality unimpaired so that I can call on you for help when I need it. If the Selom operate on you, you will be useless to me." "Operate? What do you mean?" "I'll tell you. The Selom are a very old and highly civilized people. For ages they have possessed scientific knowledge for which the upper-world scientists are now blindly groping. Among other things, they have a perfect knowledge of the workings of the brain. If they operate they will remove from your brain every speck of memory you have of past events, leaving only those things that will be useful to Saranoff. You will be his complete slave. In that condition you will be taught to fly a plane. When the time comes, you will fly one with no remembrance of anything which happened prior to the operation and with no will but his. It will be easier to teach you flying in your natural state if you are willing. You will be willing." "If you wish it, Doctor." * * * * * "I do wish it, most decidedly," Dr. Bird went on. "Obey every order they give you. You will find that the Selom are an enlightened and civilized race. They are very kindly and would willingly harm no one." "Then why have they taken up with Saranoff?" "He is the first man with whom they have come into contact. He has told them a horrible tale of conditions on the surface, and they have swallowed it, hook, line and sinker. They believe that he is going to establish a new order of happiness and plenty for all with the aid of his gang of cutthroats from Russia. If they had the slightest inkling of the true state of affairs, they would turn on him in an instant." "Why don't you tell them?" "Remember that I am a stranger here and he has poisoned their minds against me. Although the mind of an ordinary men is an open book to them, they cannot read Saranoff's secret thoughts against his will. They can't read mine either, for that matter. I am working in the laboratory and I will pick up a great deal. When the time comes, we will strike for our liberty and for the safety of the world." "Did you learn Saranoff's plans?"