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That part of the trees will be seen to lie in the least dark shadow
which is farthest from the earth.
To prove it let a p be the tree, n b c the illuminated
hemisphere [the sky], the under portion of the tree faces the earth
p c, that is on the side o, and it faces a small part of the
hemisphere at c d. But the highest part of the convexity a faces
the greatest part of the hemisphere, that is b c. For this
reason--and because it does not face the darkness of the earth--it
is in fuller light. But if the tree has dense foliage, as the
laurel, arbutus, box or holm oak, it will be different; because,
although a does not face the earth, it faces the dark [green] of
the leaves cut up by many shadows, and this darkness is reflected
onto the under sides of the leaves immediately above. Thus these
trees have their darkest shadows nearest to the middle of the tree.
4
37.
OF THE SHADOWS OF VERDURE.
The shadows of verdure are always somewhat blue, and so is every
shadow of every object; and they assume this hue more in proportion
as they are remote from the eye, and less in proportion as they are
nearer. The leaves which reflect the blue of the atmosphere always
present themselves to the eye edgewise.
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