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the side r c, which faces the dark wall a e must participate of
its darkness and, in the same way that the outer surface which faces
the light d a participates of the light; thus we get the outlines
of the extremes on each side of the centre included between them.]
This is divided into four parts. The first the extremes, which
include the compound shadow, secondly the compound shadow between
these extremes.
1
79.
THE ACTION OF THE LIGHT AS FROM ITS CENTRE.
If it were the whole of the light that caused the shadows beyond the
bodies placed in front of it, it would follow that any body much
smaller than the light would cast a pyramidal shadow; but experience
not showing this, it must be the centre of the light that produces
this effect.
[Footnote: The diagram belonging to this passage is between lines 4
and 5 in the original. Comp. the reproduction Pl. IV, No. 4. The
text and drawing of this chapter have already been published with
tolerable accuracy. See M. JORDAN: "Das Malerbuch des Leonardo da
Vinci". Leipzig 1873, P. 90.]
PROOF.
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