Universitätsbibliothek HeidelbergUniversitätsbibliothek Heidelberg
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V.] The Measure of the Universe. 161

measurable space. In other words, we require
to define the extreme limits on either hand
within which no fount of original light is
found except our own sun, since the distances
of the stars are beyond accurate measurement.
But the distance of the limiting point of solar
or measurable space, or rather the radius of
the limiting horizon (since the distance will
be the same in every direction) is about
twenty-five hundred million times the length
of the earth's polar axis ; so that that axis is
contained in the radius of measurable space
two hundred and fifty times as often as itself
contains the edge of the casing-stone. Now,
if that casing-stone be divided into twenty-
five equal parts, each of such parts will, as
We have seen, contain our own inch increased
by its thousandth part. This unit, therefore,
which we may call the polar inch, measures
not only the axis of the earth, but of the
depths of solar or measurable space, being
contained in the former two hundred and fifty

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