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to atoms by the shock?"

I. "We might steer by the stars to a point on the planet's orbit, mathematically fixed in advance, and wait there until it comes up. The atmosphere of the approaching planet would act as a kind of buffer, and the fall of the car could be further checked by our means of recoil, and also by a large parachute. We should probably be able to descend quite slowly to the surface in this way without damage; but in case of peril, we could have small parachutes in readiness as life-buoys, and leap from the car when it was nearing the ground."

G. "I presume you are taking into account the velocity of the planet in its orbit? That of the earth is 18 miles a second, or a hundred times faster than a rifle bullet; that of Venus, which is nearer the sun, is a few miles more; and that of Mars, which is further from the sun, is rather less."

I. "For that reason the more distant planets would be preferable to land on. Uranus, for instance, has an orbital velocity of four miles a second, and his gravity is about three-fourths that of the earth. Moreover, his axis lies almost exactly on the plane of the ecliptic, so that we could choose a waiting place on his orbit where the line of his axis lay in the direction of his motion, and simply descend on one of his poles, at which the stationary atmosphere would not whirl the car, and where we might also profit by an ascending current of air. The attraction of the sun is so slight at the distance of Uranus, that a stone flung out of the car would have no perceptible motion, as it would only fall towards the sun a mere fraction of an inch per second, or some 355 feet an hour; hence, as Dr. Preston has calculated, one ounce of matter ejected from the car towards the sun every five minutes, with a velocity of 880 feet a second, would suffice to keep a car of one and a half tons at rest on the orbit of the planet. Indeed, the vitiated air, escaping from the car through a small hole by its own pressure, would probably serve the purpose. Just before the planet came up, and in the nick of time we could fire some rockets, and give the car a velocity of two or three miles a second in the direction of the planet's motion, so that he would overtake us, with a speed not over great to ensure a safe descent. Our parachutes would be out, and at the first contact with the atmosphere, the car would probably be blown away; but it would soon acquire the velocity of the planet, and gradually sink downwards to the surface."

G. "What puzzles me is how you are to get back to the earth."

I. "Whoever goes must take the risk; but if, as appears likely, both Mars and Venus are inhabited by intelligent beings, we should probably be able to construct another cannon and return the way we came."

G. (smiling). "Well, I confess the project does not look so impracticable as it did. After all, travelling in a vacuum seems rather pleasant. One of these days, I suppose, we astronomers will be packed in bullets and fired into the ether to observe eclipses and comets' tails."

I. "In all that has been said we have confined ourselves to ways and means already known; but science is young, and we shall probably discover new sources of energy. It may even be possible to dispense with the gun, and travel in a locomotive car. Lord Kelvin has shown that if Lessage's hypothesis of gravitation be correct, a crystal or other body may be found which is lighter along one axis than another, and thus we may be able to draw an unlimited supply of power from gravity by simply changing the position of the crystal; for example, by raising it when lighter, and letting it fall when heavier. This form of 'perpetual motion' might be equally obtainable if Dr. Preston's[3] theory of an ether as the cause of gravity be true. Indeed, Professor Poynting is now engaged in searching for such a crystal, which, if discovered, will upset the second law of thermo-dynamics. I merely mention this to show that science is on the track of concealed motive powers derived from the ether, and we cannot now tell what the engines of the future will be like. For ought we know, the time is coming when there will be a regular mail service between the earth and Mars or Venus, cheap trips to Mercury, and exploring expeditions to Jupiter, Saturn, or Uranus."

[3] Philosophical Magazine, February, 1895.


CHAPTER III. A NEW FORCE.

"SIR,

"I have read your article on the possibility of travelling to the other members of the Solar system with much interest. It is a problem at which I, myself, have been working for a great many years, and I believe that I have now discovered a means of solving it in a practical manner. If you would care to see my experiments, and will do me the honour of coming here, I shall be glad to show them in confidence any time you may appoint.—Yours truly,

"NASMYTH CARMICHAEL."

The above letter, marked "Private," was forwarded to me through the editor of The Day After To-morrow. The writer of it was a total stranger to me, even by report, and at first I did not know what to make of it. Was the man a charlatan, or a "crank?" There were no signs of craziness or humbug in his frank and simple sentences. Had he really found out a way of crossing the celestial spaces? In these days it is better not to be too sceptical as to what science will accomplish. It is, in fact, wise to keep the mind open and suspend the judgment. We are standing on the threshold of the Arcana, and at any hour the search-light of our intellect may penetrate the darkness, and reveal to our wondering gaze the depths of the inner mechanism of Nature.

I resolved to accept his invitation.

A few days later I presented myself at the home of my unknown correspondent. It was a lonely little cottage, in the midst of a wild flat or waste of common ground on the outskirts of London. I should say it had once been the dwelling of a woodman engaged in the neighbouring forest. A tall, thick hedge of holly surrounded the large garden, and almost concealed it from the curiosity of an occasional wanderer on the heath.

Certainly it did not look the sort of place to find a man of science, and the old misgivings assailed my mind in greater force than ever. Half regretting that I had come, and feeling in a dubious element, I opened the wicket, and knocked at the door.

It was answered by a young woman, in a plain gown of some dark stuff, with a white collar round the neck. In spite of her dress I could see that she was not an ordinary cottage girl. Pretty, without being beautiful, there was a distinction in her voice and manner which bespoke the gentlewoman. With a pleasant smile, she welcomed me as one who had been expected, and ushered me into a small sitting-room, poorly furnished, but with a taste and refinement unusual in a workman's home. A large piano stood in one of the corners, and a pile of classical music lay on a chair beside it. The mantelpiece was decorated with cut flowers, and the walls were hung with portraits and sketches in crayons and water-colour.

"My father will be down in a moment," she said, with a slight American accent. "He is delighted to have the pleasure of meeting you. It is so kind of you to come."

Before I had time to respond, Mr. Carmichael entered the parlour. He was a man of striking and venerable presence. His long white locks, his bulging brow, pregnant with brain, his bushy eyebrows and deep blue-grey eyes, his aquiline nose and flowing beard, gave an Olympian cast to his noble head. Withal, I could not help noticing that his countenance was lined with care, his black coat seamed and threadbare, his hands rough and horny, like those of a workman. If he appeared a god, it was a god in exile or disgrace; a Saturn rather than a Jove.

"Now to the matter," said he, after a few words of kindly welcome. "Evidently the question of inter-planetary travel is coming to the front. In your article you suggest that a locomotive car, that is to say, a car able to propel itself through what we, in our ignorance, call empty space, though, in reality, it is chock-full, and very 'thrang' as the Scotch say, might yet be contrived, and even worked by energy drawn from the ether direct. When I read that, sir, I sat up and rubbed my eyes."

"Your spectacles, father," said Miss Carmichael.

"Well, it's the same thing," went on the old man. "For like many another prophet, sir, you had prophesied better than you knew."

"How do you mean?" I inquired, with a puzzled air.

"If you will step with me into the garden I will show you."

I rose and followed him into a large shed, which was fitted up as a workshop and laboratory. It contained several large benches, provided with turning lathes and tools, a quantity of chemicals, and scientific apparatus.

"I am going to do a thing that I have never done in my life before," said Mr. Carmichael, in a sad and doubtful tone; "I have kept this secret so long that it seems like parting with myself to disclose it, to disclose even the existence of it. I have fed upon it as a young man feeds on love. It has been my nourishment, my manna in the wilderness of this world, my solace under a thousand trials, my inspiration from on High. I verily believe it has kept my old carcase together. Mind!" he added, with a penetrating glance of his grey eyes, which gleamed under their bushy brows like a pool of water in a cavern overhung with brambles, "promise me that whatever you see and hear will remain a secret on your part. Never breathe a word of it to a living soul. You are the only person, except my own daughter, whom I have ever taken into my confidence."

I gave him my word of honour.

"Very well," he continued, lifting a small metal box from one of the tables, and patting it with his hand. "I have been working at the subject of aerial navigation for well-nigh thirty years, and this is the result."

I looked at the metal case, but could see nothing remarkable about it.

"It seems a little thing, hardly worth a few pence, and yet how much I have paid for it!" said the inventor, with a sigh, and a far-away expression in his eyes. "Many a time it has reminded me of the mouse's nest that was turned up by the ploughshare.

"'Thy wee bit heap o' strae and stibble
  Has cost thee mony a weary nibble.'

Of course this is only a model."

"A model of a flying machine?" I inquired, in a tone of surprise.

"You may call it so," he answered; "but it is a flying machine that does not fly or soar in the strict sense of the words, for it has neither wings nor aeroplane. It is, in fact, an aerial locomotive, as you will see."

While he spoke, Mr. Carmichael opened the case of the instrument, and adjusted the mechanism inside. Immediately afterwards, to my astonishment, the box suddenly left his hands, and flew, or rather glided, swiftly through the air, and must have dashed itself against the wall of the laboratory had not its master run and caught it.

"Wonderful!" I exclaimed, forgetting the attitude of caution and reserve which I had deemed it prudent to adopt.

The inventor laughed with childish glee, enjoying his triumph, and stroking the case as though it were a kitten.

"It would be off again if I would let it. Whoa, there!" said he, again adjusting the mechanism. "I can make it rise, or sink, or steer, to one side or the other, just as I please. If you will kindly hold it for a minute, I will make it go up to the ceiling. Don't be afraid, it won't bite you."

I took the uncanny little instrument in my hands, whilst Mr. Carmichael ascended

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