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,