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remain almost of the same colour and medium tone as the mist.
WHY OBJECTS WHICH ARE HIGH UP AND AT A DISTANCE ARE DARKER THAN
THE
LOWER ONES, EVEN IF THE MIST IS UNIFORMLY DENSE.
Of objects standing in a mist or other dense atmosphere, whether
from vapour or smoke or distance, those will be most visible which
are the highest. And among objects of equal height that will be the
darkest [strongest] which has for background the deepest mist. Thus
the eye h looking at a b c, towers of equal height, one with
another, sees c the top of the first tower at r, at two degrees
of depth in the mist; and sees the height of the middle tower b
through one single degree of mist. Therefore the top of the tower
c appears stronger than the top of the tower b, &c.
4
68.
OF THE SMOKE OF A TOWN.
Smoke is seen better and more distinctly on the Eastern side than on
the Western when the sun is in the East; and this arises from two
causes; the first is that the sun, with its rays, shines through the
particles of the smoke and lights them up and makes them visible.
The second is that the roofs of the houses seen in the East at this
time are in shadow, because their obliquity does not allow of their
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