Volume Volume1\Botany for Painters & Elements of Landscape Painting
Entry# 423. The proportions of light and shade in a leaf (423-426).
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OF THE SHADOWS OF A LEAF.
Sometimes a leaf has three accidents of light that is: shade,
lustre reflected light and transparency transmitted light . Thus,
if the light were at _n_ as regards the leaf _s_, and the eye at
_m_, it would see _a_ in full light, _b_ in shadow and _c_
transparent.