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
the reflection of colours (281--283).--On the use of dark and light
colours in painting (284--286).--On the colours of the rainbow
(287--288).