Chap. 2. _A Recital of some Opinions about Blackness, and which the Author inclines to_ (117.) _which he further insists on and explicates_ (118, 119.) _and shews for what reasons he imbrac'd that Hypothesis_ (120.) _First, from the contrary Nature of Whiteness and Blackness, White reflecting most Beams outwards, Black should reflect most inward_ (120.) _Next, from the Black appearance of all Bodies, when Shadow'd; And the manner how this paucity of Reflection outwards is caus'd, is further explicated, by shewing that the Superficial parts may be Conical and Pyramical_ (121.) _This and other Considerations formerly deliver'd, Illustrated by Experiments with black and white Marble_ (122, 123.) _Thirdly, from the Black appearance of Holes in white Linnen, and from the appearance of Velvet stroak'd several ways, and from an Observation of Carrots_ (124, 125.) _Fourthly, from the small Reflection from Black in a darkned Room_ (125, 126.) _Fifthly, from the Experiment of a Checker'd Tile expos'd to the Sun-beams_ (127.) _which is to be preferr'd before a Similar Experiment try'd in_ Italy, _with black and white Marble_ (128.) _Some other congruous Observations_ (129.) _Sixthly, from the Roasting black'd Eggs in the Sun_ (130.) _Seventhly, by the Observation of the Blind man lately mention'd, and of another mention'd by_ Bartholine (130.) _That notwithstanding all these Reasons, the Author is not absolutely Positive, but remains yet a Seeker after the true Nature of Whiteness and Blackness._ (131, 132.) Experiments _in Consort, touching_ Whiteness _and_ Blackness. _The first_ Experiment, _with a Solution of Sublimate, made White with Spirit of Urine_, &c. (133, 134.) _The second_ Experiment, _with an Infusion of Galls, made Black with Vitriol_, &c. (135, 136.) _further Discours'd of_ (137.) _The third_ Experiment, _of the Blacking of Hartshorn, and Ivory, and Tartar, and by a further Calcination making them White_ (138, 139.) _The fourth_ Experiment, _limiting the_ Chymist's _principle_, Adusta nigra sed perusta alba, _by several Instances of Calcin'd Alabaster, Lead, Antimony, Vitriol, and by the Testimony of_ Bellonius, _about the white Charcoles of_ Oxy-cædar, _and by that of_ Camphire. (140, 141, 142.) _That which follows about Inks was misplac'd by an Errour of the Printer, for it belongs to what has been formerly said of Galls_ (142, 143.) _The fifth_ Experiment, _of the black Smoak of Camphire_ (144.) _The sixth_ Experiment, _of a black_ Caput Mortuum, _of Oyl of Vitriol, with Oyl of Worm-word, and also with Oyl of Winter-Savory_ (145.) _The seventh_ Experiment, _of whitening Wax_ (146.) _The eighth_ Experiment, _with Tin-glass, and Sublimate_ (147, 148.) _The ninth_ Experiment, _of a Black powder of Gold in the bottom of_ Aqua-fortis, _and of the Blacking of Refin'd Gold and Silver_ (148, 149.) _The tenth_ Experiment, _of the staining Hair, Skin, Ivory_, &c. _Black, with Crystals of Silver_ (150, 151.)