)
_The eighteenth_ Experiment, _Of several Compositions of Blew and Yellow
which produce not a Green, and of the production of a Green by other
Colours_ (241, 242.)
_The nineteenth_ Experiment, _contains several instances of producing
Colours, without the alteration of any Hypostatical principle, by the
Prism, Bubbles, and Feathers_ ( from 242 to 245.)
_The twentieth_ Experiment _Of turning the Blew of Violets into a Red by
Acid Salts, and to a Green by Alcalizate (245, 246.) and the use of it for
Investigating the Nature of Salts_ (247, 248.)
_The one and twentieth_ Experiment, _of the same Changes effected by the
same means on the Blew Tinctures of Corn-flowers_ (249, 250.) _And some
Restrictions to shew it not to be so general a propriety as one might
imagine_ (251.)
_The twenty second_ Experiment, _of turning a Solution of Verdigrease into
a Blew, with Alcalizate and Urinous Salts_ (252, 253, 254.)
_The twenty third_ Experiment, _of taking away the Colour of Roses with the
Steams of Sulphur, and heightning them with the Steams Condens'd into Oyl
of Sulphur_ per Campanam (254, 255.)
_The twenty fourth_ Experiment, _of Tinging a great quantity of Liquor with
a very little Ting'd Substance, Instanced in_ Cochineel (from 255 to 257.
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