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 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 . . . 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?"
"I have not," said the Provincial Mayor.
"It is simply this. That Space, as our mathematicians
have it, is spoken of as having three dimensions, which one may call Length,
Breadth, and Thickness, and is always definable by reference to three planes,
each at right angles to the others. But some philosophical people have been
asking why three dimensions particularly why not another direction at right
angles to the other three? and have even tried to construct a Four-Dimension
geometry. Professor Simon Newcomb was expounding this to the New York Mathematical
Society only a month or so ago.
You know how on a flat surface, which has only
two dimensions, we can represent a figure of a three-dimensional solid, and
similarly they think that by models of three dimensions they could represent
one of four if they could master the perspective of the thing. See?"
"I think so," murmured the Provincial Mayor; and,
knitting his brows, he lapsed into an introspective state, his lips moving as
one who repeats mystic words. "Yes, I think I see it now," he said
after some time, brightening in a quite transitory manner.
"Well, I do not mind telling you I have been at work upon
this geometry of Four Dimensions for some time. Some of my results are curious.
For instance, here is a portrait of a man at eight years old, another at
fifteen, another at seventeen, another at twenty-three, and so on. All these
are evidently sections, as it were, Three-Dimensional representations of his
Four-Dimensioned being, which is a fixed and unalterable thing."
"Scientific people," proceeded the Time Traveller,
after the pause required for the proper assimilation of this, "know very
well that Time is only a kind of Space. Here is a popular scientific diagram, a
weather record. This line I trace with my finger shows the movement of the
barometer.
Yesterday it was so high, yesterday night it fell, then this morning
it rose again, and so gently upward to here. Surely the mercury did not trace
this line in any of the dimensions of Space generally recognized? But certainly
it traced such a line, and that line, therefore, we must conclude was along the
Time-Dimension."
"But," said the Medical Man, staring hard at a coal
in the fire, "if Time is really only a fourth dimension of Space, why is
it, and why has it always been, regarded as something different? And why cannot
we move in Time as we move about in the other dimensions of Space?"
The Time Traveller smiled. "Are you sure we can move
freely in Space? Right and left we can go, backward and forward freely enough,
and men always have done so. I admit we move freely in two dimensions. But how
about up and down? Gravitation limits us there."
"Not exactly," said the Medical Man. "There are
balloons."
"But before the balloons, save for spasmodic jumping and
the inequalities of the surface, man had no freedom of vertical movement."
"Still they could move a little up and down," said
the Medical Man.
"Easier, far easier down than up."
"And you cannot move at all in Time, you cannot get away
from the present moment."
"My dear sir, that is just where you are wrong. That is
just where the whole world has gone wrong. We are always getting away from the
present movement. Our mental existences, which are immaterial and have no
dimensions, are passing along the Time-Dimension with a uniform velocity from
the cradle to the grave. Just as we should travel down if we began our
existence fifty miles above the earth's surface."
to be continuous..............................
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