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Although the points of luminous pyramids may extend into shaded
places and those of pyramids of shadow into illuminated places, and
though among the luminous pyramids one may start from a broader base
than another; nevertheless, if by reason of their various length
these luminous pyramids acquire angles of equal size their light
will be equal; and the case will be the same with the pyramids of
shadow; as may be seen in the intersected pyramids a b c and d e
f, which though their bases differ in size are equal as to breadth
and light.
[
Footnote: 51--55: This supplementary paragraph is indicated as being
a continuation of line 45, by two small crosses.]
The difference between light and lustre (132--135).
1
32.
Of the difference between light and lustre; and that lustre is not
included among colours, but is saturation of whiteness, and derived
from the surface of wet bodies; light partakes of the colour of the
object which reflects it (to the eye) as gold or silver or the like.
1
33.
117
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