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(
208--210).--Appendix:--On shadows in movement (211--212).--SIXTH
BOOK ON LIGHT AND SHADE.--The effect of rays passing through holes
213. 214).--On gradation of shadows (215. 216).--On relative
(
proportion of light and shadows (216--221).
IV.
PERSPECTIVE OF DISAPPEARANCE
Definition (222. 223).--An illustration by experiment (224).--A
guiding rule (225).---An experiment (226).--On indistinctness at
short distances (227--231).--On indistinctness at great distances
(
232--234).--The importance of light and shade in the Prospettiva
de' perdimenti (235--239).--The effect of light or dark backgrounds
on the apparent size of objects (240--250).--Propositions on
Prospettiva de' perdimenti from MS. C. (250--262).
V.
THEORY OF COLOURS
The reciprocal effects of colours on objects placed opposite each
other (263--271).--Combination of different colours in cast shadows
(
272).--The effect of colours in the camera obscura (273. 274).--On
the colours of derived shadows (275. 276).--On the nature of colours
277. 278).--On gradations in the depth of colours (279. 280).--On
(
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