were so poor. We had planned on Williams for a month and I wanted him. And Bird was so easy that I couldn't resist it."
"And what did you get? Not as much menthium as would have come from an ordinary bookkeeper."
"I'll admit that Bird is a grossly overrated man. He must have worked in sheer luck in his work in the past, for there was nothing in his brain to show it above average. We got barely enough menthium to replace what we used in capturing him."
"We ought to have taken Carnes and left Bird alone," snorted Carson. "Even a wooden-headed detective ought to have given us a better supply than Bird yielded."
"We are bound to meet with disappointments once in a while. I had marked Bird down long ago as soon as I could get a chance at him."
"Well, you ran that show, Slavatsky, but I'll warn you that we aren't going to let you pull off another one like it. I take no more crazy chances, even on your orders."
The hunchback rose to his feet, his eyes glittering ominously.
"What do you mean, Carson?" he asked slowly, his hand slipping behind him as he spoke.
"Don't try any rough stuff, Slavatsky!" warned Carson sharply. "I can pull a tube as fast as you can, and I'll do it if I have to."
"Gentlemen, gentlemen!" protested the third man rising, "we are all too deep in this to quarrel. Sit down and let's talk this over. Carson is just worried."
"What is there to be worried about?" grunted the dwarf as he slid back into his chair. "Everything has gone nicely so far and no suspicion has been raised."
"Maybe it has and then again maybe it hasn't," growled Carson. "I think this Bird episode to-night looks bad. In the first place, it came too opportunely and too easily. In the second place Bird should have yielded more menthium, and in the third place, did you notice his hands? They weren't the type of hands to expect on a man of his type."
"Nonsense, they were acid stained."
"Acid stains can be put on. It may be all right, but I am worried. While we are talking about this matter, there is another thing I want cleared up."
"What is it?"
"I think, Slavatsky, that you are holding out on us. You are getting more than your share of the menthium."
Again the dwarf leaped to his feet, but the peace-maker intervened.
"Carson has a right to look at the records, Slavatsky," he said. "I am satisfied, but I'd like to look at them, too. None of us have seen them for two months."
The dwarf glared at first one and then the other.
"All right," he said shortly and limped to a cabinet on the wall. He drew a key from his pocket and opened it and pulled out a leather-bound book. "Look all you please. I was supposed to get the most. It was my idea."
"You were to get one share and a half, while Willis, Frink and I got one share each and the rest half a share," said Carson. "I know how much has been given and it won't take me but a minute to check up."
He bent over the book, but Willis interrupted.
"Better put it away, Carson," he said, "here come the rest and we don't want them to know we suspect anything."
He pointed toward a disc on the wall which had begun to glow. Slavatsky looked at it and grasped the book from Carson and replaced it in the cabinet. He moved over and started the generator and the tube began to glow with a violet light. A noise came from the outside and the door opened. Four men entered carrying a fifth whom they propped up in the chair under the glowing tube.
"Did everything go all right?" asked the dwarf eagerly.
"Smooth as silk," replied one of the four. "I hope we get some results this time."
The dwarf bent over the ray apparatus and made some adjustments and the head of the unconscious man was bathed with a violet glow. For three minutes the flood of light poured on his head and then the dwarf shut off the light and Carson and Willis lifted the figure and laid it on the operating table. The dwarf bent over the man and inserted the needle of a hypodermic syringe into the back of the neck at the base of the brain. The needle was an extremely long one, and Dr. Bird gasped as he saw four inches of shining steel buried in the brain of the unconscious man.
Slowly Slavatsky drew back the plunger of the syringe and Dr. Bird could see it was being filled with an amber fluid. For two minutes the slow work continued, until a speck of red appeared in the glass syringe barrel.
"Seven and a half cubic centimeters!" cried the dwarf in a tone of delight.
"Fine!" cried Carson. "That's a record, isn't it?"
"No, we got eight once. Now hold him carefully while I return some of it."
Slavatsky slowly pressed home the plunger and a portion of the amber fluid was returned to the patient's skull. Presently he withdrew the needle and straightened up and held it toward the light.
"Six centimeters net," he announced. "Take him back, Frink. I'll give Carson and Willis their share now and we'll take care of the rest of you when you return. Is the ship well stocked?"
"Enough for two or three more trips."
"In that case, I'll inject this whole lot. Better get going, Frink, it's pretty late."
The four men who had brought the patient in stepped forward and lifted him from the table and bore him out. Dr. Bird dropped the canvas screen and strained his ears. A faint whir told him that the globe had taken to the air. He slid back along the limb of the tree until he touched the rope and silently climbed hand over hand until he gained the crest. He bent his back to the task of raising Carnes, and the operative soon stood beside him on the ledge surmounting the cliff.
"What on earth were they doing?" asked Carnes in a whisper.
"That was Professor Williams of Yale. They were depriving him of his memory. There will be another amnesia case in the papers to-morrow. I haven't time to explain their methods now: we've got to act. You have a flash-light?"
"Yes, and my gun. Shall we break in? There are only three of them, and I think we could handle the lot."
"Yes, but the others may return at any time and we want to bag the whole lot. They've done their damage for to-night. You heard my orders to Lieutenant Maynard, didn't you?"
"Yes."
"He should be somewhere in these hills to the south with assistance of some sort. The signal to them is three long flashes followed in turn by three short ones and three more long. Go and find them and bring them here. When you get close give me the same light signal and don't try to break in unless I am with you. I am going to reconnoitre a little more and make sure that there is no back entrance through which they can escape. Good luck. Carnes: hurry all you can. There is no time to be lost."
The secret service operative stole away into the night and Dr. Bird climbed back down the rope and took his place at the window. Willis lay on the operating table unconscious, while Slavatsky and Carson studied the now partially emptied syringe.
"You gave him his full share all right," Carson was saying. "I guess you are playing square with us. I'll take mine now."
He lay down on the operating table and the dwarf fitted an anesthesia cone over his face and opened the valve of the gas cylinder. In a moment he closed it and rolled the unconscious man on his face and deftly inserted the long needle. Instead of injecting a portion of the contents of the syringe as Dr. Bird had expected to do, he drew back on the plunger for a minute and then took out the needle and held the syringe to the light.
"Well, Mr. Carson," he said with a malignant glance at the unconscious figure, "that recovers the dose you got a couple of weeks ago while Willis watched me. I don't think you really need any menthium; your brain is too active to suit me as it is."
He gave an evil chuckle and walked to the far side of the cave and opened a secret panel. He drew from a recess a flask and carefully emptied a portion of the contents