this is likely to continue until it
will revolve on its axis, not once a day, but once a year,
presenting always the same face to the sun.

We can only measure time by _uniform_ motion. Observe the vicious
circle. Uniform motion means the covering of equal spaces in equal
times. But how are we to determine our equal times? Ultimately we
have no other criterion save the uniform motion of the clock-hand or
the star dial. The very expressions, "uniform motion," "equal times,"
beg the whole question of the nature of time.

Let us then, in this predicament, consider time not from the
standpoint of experiment, but of conscious experience--what Bergson
calls "real duration."

Every point along the line of memory, of conscious experience, has
been traced out by that unresting stylus we call "the present moment."
The question of its rate of motion we will not raise, as it is one
with which we have found ourselves impotent to deal. We believe on
the best of evidence that the conscious experience of others is
conditioned like our own. For better understanding let us have
recourse to a homely analogy: let us think of these more or less
parallel lines of individual experience in the semblance of the
strands of a skein of flax. Now if, _at the present moment_, this
skein were cut with a straight knife at right angles to its length,
the cut end would represent the _time plane_--that is, the present
moment of all--and it would be the same for all providing that the
time plane were flat _But is it really flat_? Isn't the straightness
of the knife a mere poverty of human imagination? Existence is always
richer and more dramatic than any diagram.

"Line in nature is not found;
Unit and universe are round.
In vain produced, all rays return;
Evil will bless and ice will burn."

Undoubtedly the flat time-plane represents with fair accuracy the
temporal conditions that obtain in the human aggregate in this world
under normal conditions of consciousness, but if we consider our
relation to intelligent beings upon distant worlds of the visible
universe the conditions might be widely different The time section
corresponding to what our straight knife made flat in the case of
the flax may be--nay, probably is--strongly curved.

RELATIVITY

This crude analogy haltingly conveys what is meant by curved time.
It is an idea which is implicit in the Theory of Relativity. This
theory has profoundly modified many of our basic concept