) _Sixthly, by Motion, which is explain'd_ (62.)
_And lastly, and chiefly, by the Union of the Saline Bodies, with the
Superficial parts of another Body, whereby both their Bigness and Shape
must necessarily be alter'd_ (63, 64.) _Explain'd by Experiments_ (65, 66.)
_That the Colour of Bodies may be Chang'd by the concurrence of two or more
of these ways_ (67.) _And besides all these, Eight Reflective causes of
Colours, there may be in Transparent Bodies several Refractive_ (68, 69)
_Why the Author thinks the Nature of Colours deserves yet a further
Inquiry_ (69.) _First for that the little Motes of Dust exhibited very
lovely Colours in a darkned Room, whilst in a convenient posture to the
Eye, which in other Postures and Lights they did not_ (70.) _And that
though the smaller Parts of some Colour'd Bodies are Transparent, yet of
others they are not, so that the first Doubt's, whether the Superficial
parts create those Colours, and the second, whether there be any Refraction
at all in the later_ (71, 72, 73.) _A famous Controversie among
Philosophers, about the Nature of Colour decided_. (74. 75.)
Chap. 4. _The controversie stated about Real and Emphatical Colours_ (75,
76.) _That the great Disparity between them seems to be, partly their
Duration in the same state, and partly, that Genuine Colours are produc'd
in Opacous Bodies by Reflection, and Emphatical in Transparent by
Refraction_ (78.
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