THE TIME MACHINE

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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