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Gradations of strength in the shadows (148. 149).
1
48.
THAT PORTION OF A BODY IN LIGHT AND SHADE WILL BE LEAST LUMINOUS
WHICH IS SEEN UNDER THE LEAST AMOUNT OF LIGHT.
That part of the object which is marked m is in the highest light
because it faces the window a d by the line a f; n is in the
second grade because the light b d strikes it by the line b e;
o is in the third grade, as the light falls on it from c d by
the line c h; p is the lowest light but one as c d falls on it
by the line d v; q is the deepest shadow for no light falls on
it from any part of the window.
In proportion as c d goes into a d so will n r s be darker
than m, and all the rest is space without shadow.
[Footnote: The diagram belonging to this chapter is No. 1 on Plate
III. The letters a b e d and r are not reproduced in facsimile
of the original, but have been replaced by ordinary type in the
margin. 5-12. The original text of these lines is reproduced within
the diagram.--Compare No 275.]
1
49.
126
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