Quest was unprepared for the question.

"A thousand dollars," he ventured.

Without hesitation Clason counted out ten one-hundred-dollar notes from his wallet and laid them on the table.

"There's your advance fee. You're ready to go to work immediately, I hope?"

"Certainly," stammered Quest.

Stunned by the swiftness of the transaction, he sat staring at the money that lay untouched before him.

To accept it would be like signing an unread contract. But he had asked for it; to refuse it was impossible. Even to delay about picking it up might arouse Clason's suspicion. Already the latter had turned away and was opening the door of a steel cabinet. Quest had one second in which to reach a decision.... He crammed the currency into his pocket.

With delicate care Clason set two objects on the table. One looked to Quest like a miniature broadcasting tower or a mooring mast for lighter than air craft. The other was a circular vat of some black material, probably carbon. Within it a series of concentric tissues were suspended from metal rings, and in a trough outside ranged four stoppered flasks containing liquids of as many different colors.

"Look at these models carefully," said Clason. "They represent two of the most remarkable discoveries of all time. The one on your left is the most destructive weapon known to man. The other I consider the most constructive discovery in the history of science. It may even lead to an understanding of the nature of life, and of the future of the spirit after death.

"Both of these were developed by my brother Philip and me together-but we have disagreed about the use to which they shall be put.

"Philip"-the inventor dropped his voice to a whisper-"wants to sell the secret of the Death Projector-the tower, there-as an instrument of war. If I should permit him to do that, it might lead to the destruction of whole nations!"

"How?" demanded Quest "I've heard of a device called the Death Ray. Is this it?"

"No, no," said Clason contemptuously. "Even in a perfected state the Ray would be a child's toy compared to the Projector. This is based on our discovery that invisible light rays of a certain wave-length, if highly concentrated, destroy life-and our additional discovery that if these are synchronized with short radio waves the effect is absolutely devastating.

"We obtain the desired concentration of invisible light by using a tellurium current-filter under the influence of alternate flashes of red and blue light. The projector can literally blanket vast areas with death, up to a top range of at least five hundred miles.

"Just picture to yourself what this means! In a s.p.a.ce of ten minutes two men can lay down a circle of destruction a thousand miles in diameter; or they can cut a swath five hundred miles long in any desired direction."

"Have you ever proved it?" demanded Quest skeptically.

"Yes, young man, we have," snapped Clason. "Right here in the laboratory-but on a minute scale, of course. However, there's no time to demonstrate now. The point is that my brother is determined to sell if he can obtain his price for the invention. He argues that instead of bringing disaster upon the world, this machine will forever discourage war by making it too terrible for any civilized nation to consider. In spite of my opposition he has opened negotiations with an ambitious Balkan power. He may actually close the sale at any moment!

"However," Clason drew a deep breath "you see this other device? Simple as it appears, it is the key to the whole situation. We can use it-you and I-to overcome Philip's will and prevent this unthinkable transaction. The two of us can do it. Alone I would be virtually helpless."

"Why not have the Projector confiscated or destroyed by our own Government?" suggested Quest. "That seems to me the only safe and sure way out of the difficulty."

"You simply do not understand," frowned Clason impatiently. "Philip is selling the plans and descriptions of the machine, not the machine itself. Even if this model and the larger test machine that we have built were destroyed-even if I were willing to have Philip sent to Leavenworth for life-he could still sell the Projector.

"But this other invention, our Osmotic Liberator, makes it possible for me to gain control of Philip and actually change his mind, through the medium of an agent. I have hired you to act as my Agent, Quest, because I can see that you are a young man of unusual character and vitality. And by way of reward I can promise you both money and a brilliant future."

The inventor poised in a tense att.i.tude on the edge of his chair as though his body were charged with electricity. His eyes seemed to dart out emanations that set Quest's blood to tingling. Then for a moment the latter lost consciousness of his physical self. It was as though he had opened a door and found himself suddenly on the brink of a new and totally strange world. He dispelled this fancy by a quick effort of the will, for he knew that he had a delicate problem on his hands and that it must be solved within a very few minutes. However he proceeded, he must act without disloyalty to his Government, and at the same time without injustice to Keane Clason.

"Tell me," he said in a husky voice, "how do you intend to use me? I do not believe in Spiritualism. I would be a poor medium."

Clason gave a short laugh.

"You are not to be a medium in that sense at all. Spiritualism as practiced is just a blind sort of groping and hoping. Osmotic Liberation, on the other hand, is an exact and opposite physico-chemical science. Here-I will show you."

Into the outer cell of the Liberator he emptied the purple vial, and so on to the innermost, which he filled with a golden-green liquid like old Chartreuse.

"The separating membranes, you understand, are permeable by these complicated solutions. Each liquid has a different osmotic pressure and therefore should, under normal conditions, interchange with the others through the membranes until all pressures are equalized. I prevent such interchange, however, by maintaining an anti-electrolysis which r.e.t.a.r.ds ionization and thus builds up what might be called osmotic potential.

"Now if an Agent-yourself for instance-submerges himself in the central cell, at the same time maintaining a physical contact with his Control at the surface of the liquid, and if then the osmotic potential is suddenly released by throwing the electrolytic switch, the host of ions thus turned loose in the outer compartments make one grand rush for the center solution, which contains the cathode.

"Under these conditions your body becomes a sort of sixth cell, and your skin another membrane in the series. Properly speaking, however, you are not a part of the electrolytic circuit but are merely present in the action. Your body acts as a catalyser, hastening the chemical action without itself being affected in any way. Physically you undergo no change whatever; but in some strange way which is, like life, beyond a.n.a.lysis, your mind flows out into the solution, while your unaltered body remains at the bottom of the tank in a state of suspended animation.

"If no Control is present, all that is needed to return your mind into your body is a throw of the electrolytic switch back to negative, whereupon you emerge from the tank exactly as you entered it. But with your Control present and in contact with your submerged body, your mind, instead of remaining suspended in the solution, flows instantly into his body and resides there subject to his will.

"This can not be done, however, unless the wills of Control and Agent have first been brought into accord. To accomplish that, we clasp hands"-Quest grasped Clason's extended hand-"and look steadily into each other's eyes.

"Now, it is well known that the vibrations of an individual's will are as distinctive as the sworls of his finger-prints. What is not so well known is that the frequency of vibration in one person can be brought into accord with that in another.

"You consciously retract your will by concentrating your mind upon the thing which you know I wish to accomplish. Gradually while we continue in this position your vibrations speed up or slow down until they acquire exactly the same frequency as my own. We are then in accord, and when your mind is liberated in the tank it is in a state which admits absorption into my body. And it is subject to my will because you have purposely attuned it to my peculiar frequency. Immediately after the transfer there will be a brief conflict, due to the instinctive desire of your will to obtain the ascendancy. But of course mine will gain the upper hand at once, since both wills will be in my frequency."

Quest felt, rather than saw, a wall of alarm closing in on him. He tried to avert his eyes, to withdraw his hand from Clason's grasp. With a nostalgic pang in the pit of his stomach he suddenly realized that he could not do so. He had gone too far-farther than any man in his position had a right to go. Having deliberately weakened his will, it seemed now to have deserted him entirely. A p.r.i.c.kling sensation coursed up his spine, his extended arm went numb, his hand trembled violently.

"Splendid!" said Clason, suddenly releasing both eye and hand. "Just as I foresaw, you will be able to attune yourself to my vibration-frequency with hardly an effort. Now please remain seated; I'll be back in a moment."

For a second after the door closed, Quest remained slumped in his chair. Then he was on his feet, shaking himself like a wet dog to free himself from the spell under which he had fallen. Something about Clason attracted and at the same time repelled him, fraying his nerves like an irritant drug and confusing his mind at the moment when he needed the full alertness of every faculty.

Invisible light-disembodied minds-will vibrations! Nothing there to get hold of. Were these things real or imaginary? Was Keane Clason a great inventor, or a madman? Would Philip prove to be a real or an imaginary scoundrel? Should he summon help, or go on alone?

Professional pride said: wait, don't be an alarmist! With his knuckles Quest tapped the table, half expecting it to melt under his fingers. The feeling and sound of the contact gave him a peculiar start. On the farther end of the table stood a letter-box-an invitation. From his pocket Quest s.n.a.t.c.hed a slip of paper, and wrote:

6 stroke 4-9:45A-Hired. If no report in 48 hours, clamp down hard.

To address a stamped envelope and slip it in with the outgoing mail was the work of seconds. But he was none too quick. He had just dropped back into a lounging att.i.tude when the door burst open and Clason flew into the room?

"We must act instantly," hissed the inventor. "Philip plans to close the transaction within a day."

In spite of himself, Quest jumped upright in his chair. Clason tapped him on the shoulder rea.s.suringly.

"It's all right," he smiled, "I'm ready for him. We'll make our move this afternoon and beat him by eighteen hours.

"Let's see." He paused. "Oh! yes. I was about to explain to you that as soon as the will of the Agent enters the body of his Control, the latter can again transfer it into the body of still another person.

"Now you understand why I advertised for a man of exceptional character? As my Agent, I want you to enter the body of Philip, and your will must be strong enough to conquer his in the battle for mastery which will begin the instant you intrude into his body. You will still be under my control, but your will must be strong enough on its own merits to overcome his. I can direct you, but your strength must be your own. That's clear, isn't it?"

"I think so," said Quest slowly. "But what becomes of me after you have frustrated Philip's plot?"

"That's the easy part of the process," smiled Clason; "but naturally you feel some anxiety about it. I simply withdraw your will from Philip, return it to your own body, and pay you a reward of ten thousand dollars."

"You're sure you can?"

"Perfectly. I have merely to touch Philip's hand to recapture your will. Then I immerse myself in the tank with the switch at plus. The osmotic action will extract both wills momentarily from my body. But the presence of two bodies and two wills in the solution together forces a balance, and each will seeks out and enters its own body. Then you and I climb out of the tank exactly as we are this minute."

"If it weren't for my belief that anything is possible," Quest shook his head, "I'd say that your claims for this invention were ridiculous."