Peering into the visiplates, the two men were poised above the immense central cone of the capital city of the Fenachrone. Viewing with infra-red light as they were, the fog presented no obstacle and the indescribable beauty of the city of concentric rings and the wonderfully luxuriant jungle growth were clearly visible. They plunged down into the council chamber, and saw Fenor, Ravindau, and Fenimol deep in conversation.

"With all the other feats of skill and sorcery you have accomplished, why don't you reconstruct their speech, also?" asked Crane, with a challenging glance.

"Well, old Doubting Thomas, it might not be absolutely impossible, at that. It would mean two projectors, however, due to the difference in speed of sound-waves and light-waves. Theoretically, sound-waves also extend to an infinite distance, but I don't believe that any possible detector and amplifier could reconstruct a voice more than an hour or so after it had spoken. It might, though--we'll have to try it some time, and see. You're fairly good at lip-reading, as I remember it. Get as much of it as you can, will you?"

As though they were watching the scene itself as it happened--which, in a sense, they were--they saw everything that had occurred. They saw Fenor die, saw the general's family board the airboat, saw the orderly embarkation of Ravindau's organization. Finally they saw the stupendous take-off of the first inter-galactic cruiser, and with that take-off, Seaton went into action. Faster and faster he drove that fifth-order beam along the track of the fugitive, until a speed was attained beyond which his detecting converters could not hold the ether-rays they were following. For many minutes Seaton stared intently into the visiplate, plotting lines and calculating forces, then he swung around to Crane.

"Well, Mart, n.o.ble old bean, solving the disappearances was easier than I thought it would be; but the situation as regards wiping out the last of the Fenachrone is getting no better, fast."

"I glean from the instruments that they are heading straight out into s.p.a.ce away from the Galaxy, and I a.s.sume that they are using their utmost acceleration?"

"I'll say they're traveling! They're out in absolute s.p.a.ce, you know, with nothing in the way and with no intention of reversing their power or slowing down--they must've had absolute top acceleration on every minute since they left. Anyway, they're so far out already that I couldn't hold even a detector on them, let alone a force that I can control. Well, let's snap into it, fellow--on our way!"

"Just a minute, d.i.c.k. Take it easy, what are your plans?"

"Plans! Why worry about plans? Blow up that planet before any more of 'em get away, and then chase that boat clear to Andromeda, if necessary.

Let's go!"

"Calm down and be reasonable--you are getting hysterical again. They have a maximum acceleration of five times the velocity of light. So have we, exactly, since we adopted their own drive. Now if our acceleration is the same as theirs, and they have a month's start, how long will it take us to catch them?"

"Right again. Mart--I sure was going off half-c.o.c.ked again," Seaton conceded ruefully, after a moment's thought. "They'd always be going a million or so times as fast as we would be, and getting further ahead of us in geometrical ratio. What's your idea?"

"I agree with you that the time has come to destroy the planet of Fenachrone. As for pursuing that vessel through intergalactic s.p.a.ce, that is your problem. You must figure out some method of increasing our acceleration. Highly efficient as is this system of propulsion, it seems to me that the knowledge of the Norlaminians should be able to improve it in some detail. Even a slight increase in acceleration would enable us to overtake them eventually."

"Hm--m--m." Seaton, no longer impetuous, was thinking deeply. "How far are we apt to have to go?"

"Until we get close enough to them to use your rays--say half a million light-years."

"But surely they'll stop, some time?"

"Of course, but not necessarily for many years. They are powered and provisioned for a hundred years, you remember, and are going to 'a distant galaxy.' Such a one as Ravindau would not have specified a _distant_ Galaxy idly, and the very closest Galaxies are so far away that even the Fenachrone astronomers, with their reflecting mirrors five miles in diameter, could form only the very roughest approximations of the true distances."

"Our astronomers are all wet in their guesses, then?"

"Their estimates are, without exception, far below the true values. They are not even of the correct order of magnitude.'"

"Well, then, let's mop up on that planet. Then we'll go places and do things."

Seaton had already located the magazines in which the power bars of the Fenachrone war-vessels were stored, and it was a short task to erect a secondary projector of force in the Fenachrone atmosphere. Working out of that projector, beams of force seized one of the immense cylinders of plated copper and at Seaton's direction transported it rapidly to one of the poles of the planet, where electrodes of force were clamped upon it.

In a similar fashion seventeen more of the frightful bombs were placed, equidistant over the surface of the world of the Fenachrone, so that when they were simultaneously exploded, the downward forces would be certain to meet sufficient resistance to a.s.sure complete demolition of the entire globe. Everything in readiness, Seaton's hand went to the plunger switch and closed upon it. Then, his face white and wet, he dropped his hand.

"No use, Mart--I can't do it. It pulls my cork. I know darn well you can't either--I'll yell for help."

"Have you got it on the infra-red?" asked Dunark calmly, as he shot up into the projector in reply to Seaton's call. "I want to see this, all of it."

"It's on--you're welcome to it," and, as the Terrestrials turned away, the whole projector base was illuminated by a flare of intense, though subdued light. For several minutes Dunark stared into the visiplate, savage satisfaction in every line of his fierce green face as he surveyed the havoc wrought by those eighteen enormous charges of incredible explosive.

"A nice job of clean-up, d.i.c.k," the Osnomian prince reported, turning away from the visiplate. "It made a sun of it--the original sun is now quite a splendid double star. Everything was volatized, clear out, far beyond their outermost screen."

"It had to be done, of course--it was either them or else all the rest of the Universe," Season said, jerkily. "However, even that fact doesn't make it go down easy. Well, we're done with this projector. From now on it's strictly up to us and _Skylark Three_. Let's beat it over there and see if they've got her done yet--they were due to finish up today, you know."

It was a silent group who embarked in the little airboat. Half way to their destination, however, Seaton came out of his blue mood with a yell.

"Mart, I've got it! We can give the _Lark_ a lot more acceleration than they are getting--and won't need the a.s.sistance of all the minds of Norlamin, either."

"How?"

"By using one of the very heavy metals for fuel. The intensity of the power liberated is a function of atomic weight, or atomic number, and density; but the fact of liberation depends upon atomic configuration--a fact which you and I figured out long ago. However, our figuring didn't go far enough--it couldn't: we didn't know anything then. Copper happens to be the most efficient of the few metals which can be decomposed at all under ordinary excitation--that is, by using an ordinary coil, such as we and the Fenachrone both use. But by using special exciters, sending out all the orders of rays necessary to initiate the disruptive processes, we can use any metal we want to. Osnome has unlimited quant.i.ties of the heaviest metals, including radium and uranium. Of course we can't use radium and live--but we can and will use uranium, and that will give us something like four times the acceleration possible with copper. Dunark, what say you snap over there and smelt us a cubic mile of uranium? No--hold it--I'll put a flock of forces on the job. They'll do it quicker, and I'll make 'em deliver the goods. They'll deliver 'em fast, too, believe us--we'll see to that with a ten-ton bar.

The uranium bars'll be ready to load tomorrow, and we'll have enough power to chase those birds all the rest of our lives!"

Returning to the projector, Seaton actuated the complex system of forces required for the smelting and transportation of the enormous amount of metal necessary, and as the three men again boarded their aerial conveyance, the power-bar in the projector behind them flared into violet incandescence under the load already put upon it by the new uranium mine in distant Osnome.

The _Skylark_ lay stretched out over two miles of country, exactly as they had last seen her, but now, instead of being water-white, the ten-thousand-foot cruiser of the void was one jointless, seamless structure of sparkling, transparent, purple inoson. Entering one of the open doors, they stepped into an elevator and were whisked upward into the control room, in which a dozen of the aged, white-bearded students of Norlamin were grouped about a banked and tiered ma.s.s of keyboards, which Seaton knew must be the operating mechanism of the extraordinarily complete fifth-order projector he had been promised.

"Ah, youngsters, you are just in time. Everything is complete and we are just about to begin loading."

"Sorry, Rovol, but we'll have to make a couple of changes--have to rebuild the exciter or build another one," and Seaton rapidly related what they had learned, and what they had decided to do.

"Of course, uranium is a much more efficient source of power," agreed Rovol, "and you are to be congratulated for thinking of it. It perhaps would not have occurred to one of us, since the heavy metals of that highly efficient group are very rare here. Building a new exciter for uranium is a simple task, and the converters for the corona-loss will, of course, require no change, since their action depends only upon the frequency of the emitted losses, not upon their magnitude."

"Hadn't you suspected that some of the Fenachrone might be going to lead us a life-long chase?" asked Dunark curiously.

"We have not given the matter a thought, my son," the Chief of the Five made answer. "As your years increase, you will learn not to antic.i.p.ate trouble and worry. Had we thought and worried over the matter before the time had arrived, you will note that it would have been pain wasted, for our young friend Seaton has avoided that difficulty in a truly scholarly fashion."

"All set, then, Rovol?" asked Seaton, when the forces flying from the projector had built the compound exciter which would make possible the disruption of the atoms of uranium. "The metal, enough of it to fill all the spare s.p.a.ce in the hull, will be here tomorrow. You might give Crane and me the method of operating this projector, which I see is vastly more complex even than the one in the Area of Experiment."

"It is the most complete thing ever seen upon Norlamin," replied Rovol with a smile. "Each of us installed everything in it that he could conceive of ever being of the slightest use, and since our combined knowledge covers a large field, the projector is accordingly quite comprehensive."

Multiple headsets were donned, and from each of the Norlaminian brains there poured into the minds of the two Terrestrials a complete and minute knowledge of every possible application of the stupendous force-control banked in all its ma.s.sed intricacy before them.

"Well, that's some outfit!" exulted Seaton in pleased astonishment as the instructions were concluded. "It can do anything but lay an egg--and I'm not a darn bit sure that we couldn't make it do that! Well, let's call the girls and show them around this thing that's going to be their home for quite a while."

While they were waiting, Dunark led Seaton aside.

"d.i.c.k, will you need me on this trip?" he asked. "Of course I knew there was something on your mind when you didn't send me home when you let Urvan, Carfon and the others go back."

"No, we're going it alone--unless you want to come along. I did want you to stick around until I got to a good chance to talk to you alone--now will be a good a time as any. You and I have traded brains, and besides, we've been through quite a lot of grief together, here and there--I want to apologize to you for not pa.s.sing along to you all this stuff I've been getting here. In fact, I really wish I didn't have to have it myself. Get me?"

"Got you? I'm 'way ahead of you! Don't want it, not any part of it--that's why I've stayed away from any chance of learning any of it, and the one reason why I am going back home instead of going with you. I have just brains enough to realize that neither I nor any other man of my race should have it. By the time we grow up to it naturally we shall be able to handle it, but not until then."

The two brain brothers grasped hands strongly, and Dunark continued in a lighter vein: "It takes all kinds of people to make a world, you know--and all kinds of races, except the Fenachrone, to make a Universe.

With Mardonale gone, the evolution of Osnome shall progress rapidly, and while we may not reach the Ultimate Goal, I have learned enough from you already to speed up our progress considerably."

"Well, that's that. Had to get it off my chest, although I knew you'd get the idea all right. Here are the girls--Sitar too. We'll show 'em around."