THE TIME MACHINE

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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,