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and near together. The topmost part of the first will be in great
part transparent and light, and will stand out against the dark
portion of the second tree. And thus it will be with all in
succession that are placed under the same conditions.
Let s be the light, and r the eye, c d n the first tree, a b
c the second. Then I say that r, the eye, will see the portion c
f in great part transparent and lighted by the light s which
falls upon it from the opposite side, and it will see it, on a dark
ground b c because that is the dark part and shadow of the tree a
b c.
But if the eye is placed at t it will see o p dark on the light
background n g.
Of the transparent and shadowy parts of trees, that which is nearest
to you is the darkest.
4
56.
That part of a tree which has shadow for background, is all of one
tone, and wherever the trees or branches are thickest they will be
darkest, because there are no little intervals of air. But where the
boughs lie against a background of other boughs, the brighter parts
are seen lightest and the leaves lustrous from the sunlight falling
on them.
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