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4
20.
That part of the body will be most illuminated which is hit by the
luminous ray coming between right angles.
[
Footnote: See Pl. XXVIII, No. 1.]
4
21.
Young plants have more transparent leaves and a more lustrous bark
than old ones; and particularly the walnut is lighter coloured in
May than in September.
4
22.
OF THE ACCIDENTS OF COLOURING IN TREES.
The accidents of colour in the foliage of trees are 4. That is:
shadow, light, lustre [reflected light] and transparency.
OF THE VISIBILITY OF THESE ACCIDENTS.
These accidents of colour in the foliage of trees become confused at
a great distance and that which has most breadth [whether light or
shade, &c.] will be most conspicuous.
302
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