The Time Traveller (for so it will be convenient to speak of him) was expounding a recondite matter to us. His grey eyes shone and twinkled, and his usually pale face was flushed and animated. The fire burned brightly, and the soft radiance of the incandescent lights in the lilies of silver caught the bubbles that flashed and passed in our glasses. Our chairs, being his patents, embraced and caressed us rather than submitted to be sat upon, and there was that luxurious after-dinner atmosphere when thought roams gracefully free of the trammels of precision. And he put it to us in this way—marking the points with a lean forefinger—as we sat and lazily admired his earnestness over this new paradox (as we thought it:) and his fecundity.

‘You must follow me carefully. I shall have to controvert one or two ideas that are almost universally accepted. The geometry, for instance, they taught you at school is founded on a misconception.’

‘Is not that rather a large thing to expect us to begin upon?’ said Filby, an argumentative person with red hair.

‘I do not mean to ask you to accept anything without reasonable ground for it. You will soon admit as much as I need from you. You know of course that a mathematical mathematical line, a line of thickness NIL, has no real existence. They taught you that? Neither has a mathematical plane. These things are mere abstractions.’

‘That is all right,’ said the Psychologist.

‘Nor, having only length, breadth, and thickness, can a cube have a real existence.’

‘There I object,’ said Filby. ‘Of course a solid body may exist. All real things—’

‘So most people think. But wait a moment. Can an INSTANTANEOUS cube exist?’

‘Don’t follow you,’ said Filby.

‘Can a cube that does not last for any time at all, have a real existence?’

Filby became pensive. ‘Clearly,’ the Time Traveller proceeded, ‘any real body must have extension in FOUR directions: it must have Length, Breadth, Thickness, and—Duration. But through a natural infirmity of the flesh, which I will explain to you in a moment, we incline to overlook this fact. There are really four dimensions, three which we call the three planes of Space, and a fourth, Time. There is, however, a tendency to draw an unreal distinction between the former three dimensions and the latter, because it happens that our consciousness moves intermittently in one direction along the latter from the beginning to the end of our lives.’

‘That,’ said a very young man, making spasmodic efforts to relight his cigar over the lamp; ‘that . . Reference . very clear indeed.’

‘Now, it is very remarkable that this is so extensively overlooked,’ continued the Time Traveller, with a slight accession of cheerfulness. ‘Really this is what is meant by the Fourth Dimension, though some people who talk about the Fourth Dimension do not know they mean it. It is only another way of looking at Time. THERE IS NO DIFFERENCE BETWEEN TIME AND ANY OF THE THREE DIMENSIONS OF SPACE EXCEPT THAT OUR CONSCIOUSNESS MOVES ALONG IT. But some foolish people have got hold of the wrong side of that idea. You have all heard what they have to say about this Fourth Dimension?’

This was the grand stair! I thought; and with the thought, a gust of a kind of angry courage came into my heart. My uncle had sent me here, certainly to run great risks, perhaps to die. I swore I would settle that “perhaps,” if I should break my neck for it; got me down upon my hands and knees; and as slowly as a snail, feeling before me every inch, and testing the solidity of every stone, I continued to ascend the stair. The darkness, by contrast with the flash, appeared to have redoubled; nor was that all, for my ears were now troubled and my mind confounded by a great stir of bats in the top part of the tower, and the foul beasts, flying downwards, sometimes beat about my face and body.

The tower, I should have said, was square; and in every corner the step was made of a great stone of a different shape to join the flights. Well, I had come close to one of these turns, when, feeling forward as usual, my hand slipped upon an edge and found nothing but emptiness beyond it. The stair had been carried no higher; to set a stranger mounting it in the darkness was to send him straight to his death; and (although, thanks to the lightning and my own precautions, I was safe enough) the mere thought of the peril in which I might have stood, and the dreadful height I might have fallen from, brought out the sweat upon my body and relaxed my joints.

But I knew what I wanted now, and turned and groped my way down again, with a wonderful anger in my heart. About half–way down, the wind sprang up in a clap and shook the tower, and died again; the rain followed; and before I had reached the ground level it fell in buckets. I put out my head into the storm, and looked along towards the kitchen. The door, which I had shut behind me when I left, now stood open, and shed a little glimmer of light; and I thought I could see a figure standing in the rain, quite still, like a man hearkening. And then there came a blinding flash, which showed me my uncle plainly, just where I had fancied him to stand; and hard upon the heels of it, a great tow–row of thunder.

Now, whether my uncle thought the crash to be the sound of my fall, or whether he heard in it God’s voice denouncing murder, I will leave you to guess. Certain it is, at least, that he was seized on by a kind of panic fear, and that he ran into the house and left the door open behind him. I followed as softly as I could, and, coming unheard into the kitchen, stood and watched him.

He had found time to open the corner cupboard and bring out a great case bottle of aqua vitae, and now sat with his back towards me at the table. Ever and again he would be seized with a fit of deadly shuddering and groan aloud, and carrying the bottle to his lips, drink down the raw spirits by the mouthful.

I stepped forward, came close behind him where he sat, and suddenly clapping my two hands down upon his shoulders — “Ah!” cried I.

My uncle gave a kind of broken cry like a sheep’s bleat, flung up his arms, and tumbled to the floor like a dead man. I was somewhat shocked at this; but I had myself to look to first of all, and did not hesitate to let him lie as he had fallen. The keys were hanging in the cupboard; and it was my design to furnish myself with arms before my uncle should come again to his senses and the power of devising evil. In the cupboard were a few bottles, some apparently of medicine; a great many bills and other papers, which I should willingly enough have rummaged, had I had the time; and a few necessaries that were nothing to my purpose. Thence I turned to the chests. The first was full of meal; the second of moneybags and papers tied into sheaves; in the third, with many other things (and these for the most part clothes) I found a rusty, ugly–looking Highland dirk without the scabbard. This, then, I concealed inside my waistcoat, and turned to my uncle.