tag="{http://www.w3.org/1999/xhtml}a">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.)

Part the Second.

Of the Nature of Whiteness and Blackness.

CHAP. I.

The reason why the Author chose the Explication of Whiteness and Blackness (93.) Wherein Democritus thought amiss of these (94.) Gassendus his Opinion about them (95.) What the Author approves, and a more full Explication of White, makinig it a Multiplicity of Light or Reflections (96, 97.) Confirm'd first by the Whiteness of the Meridian Sun, observ'd in Water (98.) and of a piece of Iron glowing Hot (99.) Secondly, by the Offensiveness of Snow to the Travellers eyes, confirm'd by an example of a Person that has Travell'd much in Russia (100.) and by an Observation out of Olaus Magnus (100.) and that the Snow does inlighten and clear the Air in the Night, confirm'd by the Mosco Physician, and Captain James (101.) But that Snow has no inherent Light, prov'd by Experience (102.) Thirdly, by the great store of Reflections, from white Bodies observ'd in a darkned Room, and by their unaptness to be Kindled by a Burning-glass (103.) Fourthly, the Specularness of White Bodies is confirm'd by the Reflections in a dark Room from other Bodies (104.) and by the appearance of a River, which both to the Eye and in a darkned Room appear'd White (105, 106.) Fifthly, by the Whiteness of distill'd Mercury, and that of the Galaxie (107, 108.) and by the Whiteness of Froth, rais'd from whites of Eggs beaten; that this Whiteness comes not from the Air, shew'd by Experiments (109, 110.) where occasionally the Whiteness of Distill'd Oyls, Hot water, &c. are shew'd (111.) That it seems not necessary the Reflecting Surfaces should be Sphærical, confirm'd by