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.)

The eleventh Experiment, about the Blackness of the Skin, and Hair of Negroes, and Inhabitants of Hot Climates. Several Objections are made, and the whole Matter more fully discours'd and stated from several notable Histories and Observations (from the 151 to the 167.)

The twelfth Experiment, of the white Powders, afforded by Precipitating several Bodies, as Crabs Eyes, Minium, Coral, Silver, Lead, Tin, Quick-silver, Tin-glass, Antimony, Benzoin, and Resinous Gumms out of Spirit of Wine, &c. but this is not Universal, since other Bodies, as Gold, Antimony, Quick-silver, &c. may be Precipitated of other Colours (168, 169, 170.)

The thirteenth Experiment, of Changing the Blackness of some Bodies into other Colours (171, 172.) and of Whitening what would be Minium, and Copper, with Tin, and of Copper with Arsnick, which with Coppilling again Vanishes; of covering the Colour of that of 1/3 of Gold with 2/3 of Silver melted in a Mass together (173, 174)

The fourteenth Experiment, of turning the black Body of Horn into a White immediately with Scraping, without changing the Substantial form, or without the Intervention of Salt, Sulphur, or Mercury (176.)

The fifteenth Experiment, contains several Instances against the Opinion of the Chymists that Sulphur Adust is the cause of Blackness, and the whole Matter is fully discuss'd and stated (from 176 to 184)

Part the Third.

Concerning Promiscuous Experiments about Colours.

Experiment the First.

IN confirmation of a former Conjecture about the Generation of Colours from diversity of Reflections are set down several Observations made in a Darkned room (186, 187.)

Experiment the second, That white Linnen seem'd Ting'd with the Red of Silk plac'd near it in a light Room (188,189.)

Experiment the third, Of the Trajection of Light through Colour'd Papers (189, 190.)

Experiment the fourth, Observations of a Prism in a dark Room (191, 192.)

Experiment the fifth, Of the Refracting and Reflecting Prismatical Colours in a light Room (193.)

Experiment the sixth, On the Vanishing of the Iris of the Prism, upon the access of a greater adventitious Light (194.)

Experiment the seventh, Of the appearances of the same Colour'd Papers by Candle-light (195, public@vhost@g@gutenberg@html@files@14504@[email protected]#Page_196" class="pginternal"