"Oh, well, it can't be helped, Doctor," replied the detective with an attempt at cheerfulness. "What is he going to do to us?"

"He'll have to use instruments for what he plans," said the doctor.

"Ordinarily a routine mental operation is performed without the use of extraneous power. The mind of the operator is electrically connected to the mind of the victim. By means of thought waves the operator banishes from the mind of the subject such portions of his memory and mentality as he chooses. He may then subst.i.tute other things in place of what he has removed. Any of the Selom could operate on you, but I doubt whether Jumor himself could do it successfully on me without aid from power. Here come the instruments."

Asmo and Camol took from a cabinet on the side of the wall what looked like a cloth helmet. Attached to it were a dozen wires which they connected to a box on a table. The box was made of crystal and inside it could be seen a number of vacuum tubes and coils of various designs. Other leads ran to a similar helmet which Asmo placed on Saranoff's head. A heavy cable ran to a switch on the wall.

As Camol closed the switch the tubes in the box began to glow with weird lights. Violet, green and orange streamers of light came from them to dance in wild patterns on the laboratory walls. For five minutes Saranoff made adjustments to dials on the front of the crystal box. The colored lights died away and a gentle golden glow came from the apparatus. He threw off the helmet.

Camol left the laboratory and returned with a large coil on the top of which was mounted a parabolic reflector. A device like a clock on the front of the coil was constantly marking the pa.s.sage of time. The dial had two indicators which were together. Saranoff chuckled.

"You may not have seen this device work, Doctor," he said. "In order to let you know what you are facing, I will demonstrate."

He turned the reflector so that it bore on the wall. He adjusted the moving dial so that the two indicators were no longer together. As he closed a switch, the wall before the reflector vanished. Saranoff turned off the power.

"That portion of the wall has gone back in time exactly three seconds," he announced. "As far as the present is concerned, it has ceased to exist. It is following us through time three seconds behind us, but in all eternity it will never catch up unless I aid it. Since the exact time is known, it can be restored. If I were to alter this adjustment ever so little, it could never be recalled. Watch me."

He again closed the switch, this time in a reverse direction. The wall instantly filled up as it had been before. He moved the time dial so that the two indicators coincided.

"After I have sent a portion of your physical brain into the past or the future as the fancy strikes me, I will change the adjustment of that dial. Since there are an infinite number of adjustments to which I might have set it, the chances that any one could ever duplicate my setting and restore it are the complement of infinity, or zero," he said. "I am now ready to remove your memory. If the impossible should happen and your physical brain be restored it would be useless. Asmo, adjust the helmet. I will operate on my friend, the Doctor, first."

Carnes strove to rush to Dr. Bird's a.s.sistance, but he was helpless before the force of Camol's will. Asmo adjusted the helmet to Dr.

Bird's head and buckled it firmly in place. With an evil grin, Saranoff donned the other helmet.

"Good-by, Dr. Bird," he said mockingly. "You will continue to see me, but you won't know me, except as your master."

His hand reached for the switch. It had almost closed on it when Saranoff stopped convulsively. He sat motionless while the laboratory door opened and Jumor entered the room. He was followed by another mole. The newcomer was fully six inches taller than the others. His head was hidden by a helmet, but around his arms he wore strings of sparkling jewels.

"Ivan Saranoff, what means this?" his powerful thoughts dominated the room.

"I was merely engaged in rectifying some of the mental errors of this man of the upper earth," explained the Russian eagerly. "It is merely a routine operation such as you gave me authority to perform."

"An operation which uses power is not routine," replied the king. "I am told that this upper-earth man has a brain equal to those of my most advanced scientist. I am also told that you planned to do more than rectify his mental errors."

"You have been falsely informed. I was merely about to adjust his memory."

"Then what means this?" The king pointed to the time-ray machine.

"That was brought here in order that it could be used when you returned," thought the Russian eagerly. "This upper-earth man killed Hanac when he brought him food."

The door opened and Hanac entered.

"Oh, Astok," objected Hanac's thoughts, "when these upper-earth men had me at their mercy, with a light, they spared me. They paralyzed me for a time so that they might escape but they did it in such a manner that no harm came to me."

"So Jumor told me," replied the king. "Release them."

In an instant Carnes was on his feet removing the helmet from Dr.

Bird's head. The doctor struggled to his feet.

"Dr. Bird," thought the king, "can you communicate with me easily?"

"Yes, Your Majesty, but may I ask that you alter the vibration period of my comrade, Mr. Carnes? He cannot understand you with his present low period."

The king stepped to the box with which Saranoff had been working. In response to his commands the helmet which had been on Dr. Bird's head was placed on the detective. The king made a few adjustments to the dials and signalled for the helmet to be removed.

"Can you understand me, Mr. Carnes?" he asked mentally.

The question leaped with startling clearness into the detective's head. Carefully he framed his answer.

"I can understand you," said the king. "I will now sit in judgment on the appeal made to me. Dr. Bird tell me your story."

With eloquent thoughts, Dr. Bird poured forth the history of the upper world. He told of the great war and the collapse of the Russian monarchy. He traced history to the fall of the moderate party and the rise of the Bolsheviki. He described the horrible conditions existing in Russia. At the end he reviewed the long battle he and Carnes had fought against Saranoff. When he had finished, the king questioned Carnes.

The detective repeated the story in different words and the king turned to Saranoff. From the Russian's mind came a tissue of distorted facts and downright lies. He denied or twisted around everything that the detective and the scientist had said. When he had done with his tale, Astok sat in secret thought for a few minutes.

"The tales you tell me are so far apart that I can give credence to none of them," he announced at length. "There is but one solution.

Although they are never used, for the Selom have forgotten the meaning of a falsehood, we have instruments which will drag the truth from the brain of a liar. They are powerful and their use may easily be fatal.

If a man gives forth the contents of his brain willingly, the process is not painful. If he tries to conceal anything, it is torture. Will you willingly submit your brains to the searching of this instrument?"

"Gladly," came Dr. Bird's thought and Carnes reechoed it.

"And you, Ivan Saranoff?" demanded the king.

"I will not submit," thought the Russian sullenly.

"You will be examined whether you submit willingly or not," replied Astok. "I am going to learn the truth though I kill you all to get it."

At the king's order, Jumor hastened from the laboratory. He returned in a few minutes with an apparatus similar to the one which Saranoff had planned to use on Dr. Bird, but larger, and with more dials on the crystal box. At a command from the king, Dr. Bird donned the helmet.

The king manipulated switches and dials. Around Dr. Bird's head glowed a halo of crimson light. Twice an expression of momentary pain pa.s.sed over his countenance. After half an hour, Astok cut on the power and nodded to Carnes.

"Don't try to hold anything back, Carnesy," said Dr. Bird sharply.

"You couldn't if you tried, and the process is very painful, I can a.s.sure you."

With the helmet on his head the detective sat for ten minutes while the Selom king went through his brain. A dozen times he shrieked in agony but his moments of suffering were short. The king removed the helmet.

"Your minds agree well," he thought. "Now I will examine the mind of my friend."

The helmet was strapped on Saranoff. Instantly an expression of the utmost anguish crossed his face. Shriek after shriek of agony came from his writhing lips. Relentlessly the king applied more power. The cries of the Russian grew heartrending. Suddenly he grew rigid and slumped forward in his chair. Astok impa.s.sively manipulated his instrument. After half an hour, he opened the switch and removed the helmet. Under the ministrations of Jumor the Russian revived. The king sat in secret thought for an hour.