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most lovely blue, much purer than their illuminated portions. And
from this it follows that when the rock of a mountain is reddish the
illuminated portions are violet (?) and the more they are lighted
the more they display their proper colour.
4
64.
A place is most luminous when it is most remote from mountains.
On the treatment of light for views of towns (465-469).
4
65.
OF LIGHT AND SHADOW IN A TOWN.
When the sun is in the East and the eye is above the centre of a
town, the eye will see the Southern part of the town with its roofs
half in shade and half in light, and the same towards the North; the
Eastern side will be all in shadow and the Western will be all in
light.
4
66.
Of the houses of a town, in which the divisions between the houses
may be distinguished by the light which fall on the mist at the
bottom. If the eye is above the houses the light seen in the space
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