Part 4

"Naturally," said Dr. Gryce. "Impossible, of course, had you held to that size." They were directing their explanations at me. I nodded. "But you didn't stay that size?" I suggested.

"No, of course not," said Brett. "But for a time, we did--I was cautious from Mars to Jupiter, Father. Nogar plunged right through the asteroid region there--plunged through at nearly his five million miles an hour velocity. I held down to three million. We kept a close watch, though Martt had a somewhat terrifying experience. Tell them, Martt."

Martt flushed a trifle. "It wasn't my fault--at least I didn't think so. At a velocity like that the space there between the orbits of Mars and Jupiter is horribly crowded. Brett was asleep. I sat by the instrument table staring down into the floor window at the black firmament into which we were dropping. You people take a voyage like this as a matter of course--but it was my first time off earth, and the beauty of it--of the heavens--well, I tell you it impressed me. The black firmament--those blazing constellations beneath us--the full moon of Jupiter every moment growing larger like a white round lamp down there.

"Well, anyway, perhaps, I was lost in thoughts of it--when leaping up out of the blackness came a great round silver disk. A hundred times the size of our full moon. Then a thousand. It was below me, but off to one side. It swept past, so close I could see its barren, rocky surface--a range of desolate gray mountains; and I could see, too, its rotation, like a ball tossed into the air slowly rotating. Before I could think to do anything--even to make a move--the asteroid went past, out of my field as I looked through the floor window. For a moment I saw it rising past a side window and then it was above us--gone completely beyond my sight in a moment or two. I want to tell you I was frightened--I called Brett down at once."

Brett laughed. "I found him white, shaking like a tower-trembler. If a collision had really threatened, he could have thrown the main Time-switch. Thrown us suddenly into the asteroid's past or future--I had told him that--but when the danger came, he never thought of it."

"I never did," Martt confessed.

"How close did the asteroid pass?" I asked. "I saw one once, on a Martian trip----"

"I suppose we passed it at a distance of some three thousand miles," Brett answered. "But at three million miles an hour we were traveling that distance in three or four seconds. It was a narrow escape. The asteroid's attraction had drawn us aside from our course--but I soon rectified that."

"I meant to explain about attraction a moment ago, Frank," Dr. Gryce interrupted. "The attraction of the vehicle on our planets is why Brett could not yet increase his size. Jupiter and Saturn were pulling the vehicle onward, and in direct proportion to the mass, of course, the vehicle was pulling at them. An infinitesimal pull--but had Brett increased its size materially--while still close to our planets--the vehicle would have been a seriously disturbing element. I did not want that. Indeed, with any great size-increase, the vehicle moving out there would have thrown our whole system into chaos."

Brett said, "I was careful to obey you, Father. We were safely beyond Saturn--and Uranus and Neptune were on the other side of the sun--before I even touched the size-switch. From the orbit of Mars to that of Jupiter there are some 334 million miles between the points we crossed. We were about 112 hours making the voyage. I kept us well away--some ten million miles. But the planet was a beautiful sight, assuming every phase from full to crescent as we passed. You have never been so close, Father? Nor you, Frank?"

"Nor I," spoke up Frannie. She said it in a whimsical fashion of pathos, as though to make us all realize that she had been neglected.

Brett laughed affectionately. "No, nor you, little sister. Well, it's a beautiful sight. You can see it similarly in the telescope, but somehow, at the same visual distance the naked eye shows it indefinably different. A beautiful silver disk with the broad dark bands upon it and the red spot glowing like a lantern in its lower hemisphere.

"Our velocity was slackened for a time as we passed Jupiter, since I had to lose its great attractive force and turn a neutral side to it. But once by it, with it blazing as a gigantic thin crescent above us, I used a full power of its repulsion. We gained velocity rapidly. With the region of minor planets passed I had no fear of using all the velocity we could obtain. I think Nogar was unskilful in the handling of his vehicle; at all events, before we reached the neighborhood of Saturn, we had attained a velocity of seven and a half million miles an hour. It was the greatest velocity we reached."

"But," I exclaimed, "but Brett, at seven and one-half million miles an hour, in your whole life-time--whether you changed your Time-rate or not, you would have to live those hours--in a whole life-time at that velocity you wouldn't get one-quarter of the distance even to the nearest star!"

"No," he agreed. "But I began using the size-change after we passed Saturn----"

I interrupted again. "I've been wondering about that--I don't quite see----"

"I'll make it clear to you, Frank, in a moment," Dr. Gryce put in. "Go on, Brett."

"We were well past Saturn before I changed our size at all. Our average velocity along there was six million miles an hour--it was a run of about seventy-five hours. We would have been--even at our maximum of seven and one-half million miles an hour--more than another 240 hours getting past Neptune's orbit. It was too tedious. We determined, since Uranus and Neptune were in other parts of their orbits--far on the other side of our sun--I decided that once we were well beyond Saturn, I would start our increase of size. We were seventy million miles beyond Saturn, with nothing of importance ahead of us but the distant stars, when I determined to start the change. The space there was comparatively deserted--a few asteroids--sometimes we could go nearly an hour without even sighting one.

"With Martt beside me--we were both a little timid about it, naturally--I threw over the switch and started our growth."

He paused for the length of a breath. "It was extraordinary--all our experience of the voyage from that moment was extraordinary. I hardly know how to begin telling you. . . ."

III

Dr. Gryce interrupted. "Just a minute, Brett--I want to make absolutely clear to Frank the principles involved in this change of size in relation to velocity."

"May I ask a question first?" I hazarded.

"All you like," said Brett.

"I'm wondering why in your normal size you could attain no greater velocity than seven and one-half million miles an hour. Theoretically, you know, a freely falling body will accelerate to infinity. And with repulsion added--a body, not only falling, but being _pushed_ downward----"

Frannie said, "Nogar found his approximate limit at five million----"

"Our limitations were similar to his," Martt put in.

"I know," I said. "I remember in the public newscasting they said----"

"We found the same conditions," Brett put in. "Our vehicle--any vehicle traveling in outer Space--is not strictly a freely falling body. For low velocities--the general voyaging from here to Mercury, Venus or Mars--Space may almost be considered a vacuum. But it is not a vacuum, as we know. The imponderable, widely separated atoms of the ether--to use the ancient word--begin to be a factor at velocities over three million miles an hour. The drag became increasingly noticeable----"

"And the heat of the friction warmed us up," Martt put in. "At six million miles an hour we were hot, let me tell you. Sweltering--even with the full refrigeration units going."

"That friction held us to seven and one-half million as our limit," Brett added. "Anything else, Frank?"

"Yes, I was wondering about our aural ray here. Could you still see it?"

"Oh yes. Our sun of the Solar System had dwindled--small, but white and brilliant. With the naked eye the little star which was our earth showed very faint but distinguishable. With the aurometer--even using its spreading field of vision so that it embraced all that portion of the sky--we could see your beam sweeping slowly across the field as the earth rotated."

"And the myrdoscope?" I suggested. "Hadn't you tried again to locate the image of that girl?" My heart thumped as I said it.

He nodded. "Beyond Jupiter, when the long hours of inactivity hung on us, I spent many of them searching ahead of us with the myrdoscope. At last I picked up the image of the girl--held it for a few moments."

"There was no change?" Dr. Gryce said eagerly.

"No. The little distance we had traveled made no change--in fact, my smaller instrument, Father, showed it rather less clearly."

"I mean no change in the girl's attitude," Dr. Gryce insisted. "No change in the attacking giant--or those grinning little dwarfs at the girl's ankle?"

"None. But she was aware of them. On her face was stark terror--as we had seen it from here, Father, a month before. I noticed that the giant's forward step had nearly been completed--and the climbing dwarf was holding tightly to her sandal cord."

Brett gazed at me inquiringly but I shook my head. "That's all I have to ask," I said. "Go ahead, Brett. You were telling us about how you started the size-change----"

Dr. Gryce put in. "I think you had best proceed, Brett. And then if there is anything Frank does not understand, we can stop and make it clear."

He nodded, but for a moment he hesitated. "I flung over the switch to start our growth," he said slowly. "It was the beginning of all those strangely weird experiences which followed now one upon the other. Frightening at first. . . ."

IV

He paused briefly, then went on: "Our first sensation was one of shock--a reeling of the senses. But it was not severe--it passed almost at once. We found ourselves clinging there to the instrument table. To me the room seemed swaying dizzily. My forehead was damp with cold moisture; a nausea possessed me. I was oppressed; the air of the room was heavy to breathe."

"The air was snapping with the current," said Martt. "I could see it, and feel it tingling against my face. And it was heavy to breathe, as Brett says."

Brett resumed: "But we felt better after a moment. I saw the change first on the dials. The pointer of the lowest unit dial of the size series was slowly but visibly moving. I watched as it crept from 1 to 2. We had doubled in size. I gazed about the room. It was unchanged; and now as my body rapidly adjusted itself to the new conditions, I began to feel almost normal. Except a queer whirring in my head, and the nausea which persisted for perhaps an hour, I felt no evidence of the growth. The room, the vehicle was untrembling. No slightest evidence within the vehicle of the size-change going on--except the creeping pointer of the lowest dial. It was moving faster; it had reached 10. The pointer of the dial beside it--registering in units of a hundred--now seemed stirring."

Brett gazed at us earnestly. "I want to make myself absolutely clear. We were then--I suppose a minute or so had elapsed--we were ten times our original size----"

"Much faster than the vehicle grew in the garden," I exclaimed.

"Yes. I had chanced the possibility of severe shock and thrown the lever at once to a quarter strength. Martt and Frannie, in the garden, had put it on only to the one-hundredth part of its power. At all intensities, the growth, you understand, constantly accelerates. At unit 10, which we reached in possibly the first minute, we were ten times our starting size--that is, for earth measurements, our vehicle from base to tower-top was then one-tenth of a mile. But soon the pointer had passed 50. And then 100--and the pointer of the hundred-unit dial had crept to 1.

"With recovered normality of senses we had gone to the windows. I want you to visualize first what always before we had seen. An inky black void everywhere surrounding us, in the center of which seemingly we hung motionless. The brilliant firmament of stars, freed from the distortion of earth's atmosphere; glittering, blazing like great diamonds. Pure white, blue-white, or tinged with yellow and red. The whole extent of the heavens swarming with them. The huge, spiral nebulous masses fleecy white, with tiny points of blazing white fire in them. And behind them all that distant ring of seeming star-dust--immeasurably distant yet glowing like a silver veil, which in the ancient books they called the 'Milky Way.'

"Near at hand, above us were the tiny planets of our Solar System. The sun, only a pale white disk from out here near Saturn; the earth--a star very faint; red Mars, a tiny reddish dot. But Jupiter was brilliant; and Saturn from our proximity was stupendously beautiful. The globe itself--a great silver disk, with the sunlight to make a narrow portion of it into a blazing crescent. The darkened areas of the globe, even on the shadowed portion, were plain almost as the bands of Jupiter. And Saturn's rings! Concentric rings--the inner one a trifle darker--opened up to a narrow angle--a glowing silver band like a broad hat-brim encircling the planet--a hat-brim over 37,000 miles broad.

[Illustration: "Saturn with its rings was stupendously beautiful from our proximity."]

"This we saw, with ourselves of unchanging size. But now we were growing. The change was at first apparent only in the aspect of Saturn--since it was closest to us. The planet seemed to become a little smaller--shrinking and creeping toward us. A contraction of its size--and as though the space between us were diminishing. Yet--as a seeming paradox--the visual diameter of the globe and the rings remained almost the same.

"It is difficult to describe. We seemed moving closer to Saturn, yet in no sense was there any apparent motion. The effect--the result--of seeming motion--not the motion itself. Martt presently went back to watch the dials. He called out to me when we had reached unit 1,000. A thousand times our original size--the vehicle now ten miles in earthly height. The change had now affected very slightly the entire firmament. Everywhere a seeming contraction--not so much in the aspect of the blazing star-points, but in the black void of Space itself. As though the void were smaller--contracted so that everything in it were of necessity a little nearer to us. But it was as yet barely noticeable. I might even have thought it a psychological co-action with the change in Saturn's aspect--a change unmistakable.

"Saturn, as we grew, had been seemingly smaller and coming visually nearer to us. Yet our velocity away from it was--in our original size--seven and one-half million miles an hour. Can I make you realize that the effect of _both_ motions was apparent? It was as though we were moving forward to lengthen a dwindling distance, with Saturn following after us simultaneously to shorten it.

"It was at the thousand unit point--ourselves then ten miles of earthly height--that I shut off the size-switch. Of visual diameter, Saturn had really not altered materially."

Brett stopped as though carefully to choose his words. "I'm striving to give you a clear picture. A distant object of great size may appear of the same diameter as something smaller and closer. But you can generally tell which is which. There is a difference of aspect--impossible to describe, but readily seen. Saturn was like that--the change in the planet was like a progressive change from the one condition to the other. It had appeared large and distant; it changed, to be smaller and closer. Just before I shut off the size-switch, when our rate of growth had become comparatively rapid, Saturn took on other motions--I'll tell you about them in a moment.

"Do I make myself clear? I want to. . . . With our growth checked, there was at once a striking, visual result. We seemed receding from Saturn so fast that its apparent diameter dwindled very rapidly--a normal dwindling of rapidly added distance. Presently it was a mere star--then a pin-point of light. Then it was vanished. Our other planets of the Solar System had preceded Saturn into invisibility. Then our sun itself became so faint a star that I lost it. We were beyond the Solar System--itself wholly lost to the naked eye among the great star-clusters enveloping it."

V

"Wait," I exclaimed. "There is so much I want to ask you, Brett."

Frannie interposed timidly: "Did you say, Brett, that on earth the vehicle then would have been ten miles in height?"

"Yes," he agreed.

She commented, "Then your relative Time-dials must have been visibly moving----"

Dr. Gryce hastily interrupted: "The practical workings of the inherent Time-change I want Brett to explain carefully. You did not move the vehicle in Time, did you, Brett?"

"No sir. Not then."

I must have looked puzzled, for Dr. Gryce added: "We mean, Frank, that the vehicle could have traveled in Time--in earth-Time, for instance, to go into our past or our future. Brett had not done that. But immediately the vehicle started a size-change, you understand, there automatically began a Time-change inherent to that growth. Normal to it, let me say."

"Oh, yes," I nodded. "I remember you explained that. In relation to its size----"

"I'll put it this way," Dr. Gryce went on. "That girl out there is moving through Time at a definite rate. Let us say a year of our Time would be measured as a second of hers."

"Less than that," Martt interjected.

"Yes lad, I know. But those rough figures will serve for the present comparison." He turned back to me. "Keep that in mind, Frank. Now conceive Brett and Martt changing progressively upward in size, from what they are here on earth, to a size normal to that girl and the realm she lives in. A corresponding Time-change must take place. At every point of the voyage in Time and size, the relative values must agree; the vehicle's Time-rate always must be in inverse proportion to its position in size."

I nodded. "I think I understand. You mean that when in size the vehicle had progressed half-way from our size to the girl's, that then the vehicle's normal Time-rate would be half-way between our Time and hers?"

"Exactly, Frank."

"At this ten-mile size what percentage of the size-journey had been made?" I asked. I smiled. "I'm trying to imagine how large that girl may be."

Brett said quickly, "I'll tell you that later. It was some distance farther on before I could calculate such relative values even as approximations."

Frannie said, "At that point, Brett, the vehicle began speeding into the earth's future, didn't it?"

Dr. Gryce exclaimed: "Child, that will only lead us into philosophical discussion. Beyond the realm of mathematics----"

"I don't think so, Father," Brett said quietly. "I would say that since everything--Size, Time and Space--is relative, depending wholly on the viewpoint of the observer--that Frannie's question is simple enough. To me as observer--to my consciousness there in the vehicle--every given instant was the Present. The earth was out there in Space, revolving about its sun; rotating on its axis--its movements to my consciousness _faster_ than before. To me it was the Present. The earth was there. I saw it through the electro-telescope. I also saw your aural ray through the aurometer. The ray swept the sky with a rapid sweep, since to my altered Time-rate the earth was rotating faster. But every given instant was my Present.

"However, compare my consciousness to yours on earth. The earth--rotating faster relative to me--had, while I watched there, made, let us say, a full rotation in that first five minutes of my vigil. Relative to me--it was the earth's future Time. I was gazing upon earth in its _tomorrow_. So I think that I was, as Frannie said, speeding into the earth's future."

Frannie was triumphant. Dr. Gryce said smilingly, "You put it clearly, Brett. But it's a philosophical and metaphysical viewpoint nevertheless. You spoke of Saturn's having another apparent motion near the end of your size-change?"

"Yes," said Brett. "As our Time-rate became materially slower, the speeding up of all the motions inherent to the planets grew visible. Saturn's rotation on its axis became readily visible through the telescope. And the globe began very slowly shifting sidewise--at nearly right angles to our course--the visual result of the intensification of its orbital movement. . . . You were going to ask a question, Frank, a moment ago?"

I had not forgotten it. "You were telling us, Brett, how you stopped your growth at the ten-mile size. Almost immediately, you said, Saturn receded into an invisibility of distance. The entire Solar System vanished into distance. You had been traveling only seven and one-half million miles an hour before changing size. It was the new velocity I wanted to ask about. The whole question of velocity relative to size."

"Relative!" Brett exclaimed. "That's the keynote to it, Frank. Two differing viewpoints, always. Keep them both in mind--the viewpoint of earth-size, and the viewpoint of the vehicle-size. I'll try and explain it now. Once clear to you, our whole experience will clarify to your understanding. Conceive, from your external viewpoint of earth, the vehicle out there in Space dropping with a velocity of seven and one-half million miles an hour. That was its maximum, owing to the ether-friction. It started to increase in size. Hence its mass grew--in proportion directly as the cube. As the mass grew greater, the atoms of the ether became of themselves relatively smaller, less ponderable, less capable of exerting their frictional drag.

"This should be very clear to you, Frank. In a vacuum, a feather and a bit of lead fall at equal rates. The mass--the weight--has nothing to do with it. But in air--where there is a friction--the heavier object falls faster. The vehicle was like that. Its mass, so enormously increased, gave it a greatly increased maximum velocity. It picked up velocity rapidly with its growth. The formulas involved are intricate--I need only say that after forty-nine minutes of traveling at the ten-mile size, we had again reached maximum. It was about 200 million miles a minute."

"A minute!" I exclaimed.

"Yes. That is 12,000 million miles an hour, as against seven and one-half million. The vehicle's length, breadth and width had each increased to a thousand times their former size. Its mass was the product of the three--hence one thousand million times greater.

"These are all approximate to the actual figures, you understand. Round numbers are less confusing. Our resultant velocity, however, was 200 million miles a minute, at the end of the first hour. We were well beyond the Solar System by then."

Frannie asked, "Brett, why didn't Saturn appear to recede until after you had stopped your growth?"

"That was merely optical, Frannie. Our velocity away from Saturn was steadily increasing. But with our increasing size, the space seemed dwindling--as though Saturn were following after us. With the growth checked there was a visual reaction--an apparent leaping away. It was merely optical. Anything else?"

"I'd like to know," I said, "the relation of your Time in the vehicle at the ten-mile size--its relation to our earth-Time."