Contiguous or Continued Particles of a Body_ (58.) _Fourthly, by a Union or Conjunction of the formerly separated Particles; Illustrated with divers Instances of precipitated Bodies_ (59.) _Fifthly, by Dislocating the parts, and putting them both into other Orders and Postures, which is Illustrated with Instances_ (60, 61.) _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.) _but that this is not to be taken in too large a Sense, the Cautionary instance of Froth is alleged and insisted on_ (78, 79.) _That the Duration is not a sufficient Characteristick, exemplify'd by the duration of Froth, and other Emphatical Colours, and the suddain fading of Flowers, and other Bodies of Real ones_ (80.) _That the position of the Eye is not necessary to the discerning Emphatical Colours, shew'd by the seeing white Froth, or an Iris cast on the Wall by a Prism, in what place of the Room soever the Eye be_ (81.) _which proceeds from the specular Reflection of the Wall_ (82.) _that Emphatical Colours may be Compounded, and that the present Discourse is not much concern'd, whether there be, or be not made a distinction between Real and Emphatical Colours_. (83.) Chap. 5. _Six Hypotheses about Colour recited_ (84, 85) _Why the Author cannot more fully Speak of any of these_ (86.) _nor Acquiesce in them_ (87, 88.) _What_ Pyrophilus _is to expect in this Treatise_ (88, 89.) _What Hypothesis of Light and Colour the Author most inclines too_ (90.) _Why he thinks neither that nor any other sufficient; and what his Difficulties are, that make him decline all Hypotheses, and to think it very difficult to stick to any._ (91, 92.)