_The twenty eighth_ Experiment, _of other differing Effects on Mary-golds,
Prim-roses, and fresh Madder_ (265.) _with an Admonition, that these Salts
may have differing Effects in the changing of the tinctures of divers other
Vegetables_ (266, 267.)

_The twenty ninth_ Experiment, _of the differing Effects of these Salts on
Ripe and Unripe Juices, instanced in Black-berries, and the Juices of
Roses_ (from 267 to 270.) _Two reasons, why the Author added this twenty
ninth_ Experiment, _the last of which is confirm'd by an Instance of Mr._
Parkinson, _consonant to the Confession of the Makers of such Colours_
(272.)

_The thirtieth_ Experiment, _of several changes in Colours by Digestion,
exemplify'd by an_ Amalgam _of_ Gold _and_ Mercury _and by Spirit of
Harts-horn. And (to such as believe it) by the changes of the_ Elixir.

_The thirty first_ Experiment, _shewing that most Tinctures drawn by
Digestion Incline to a Red, instanc'd in_ Jalap, Guaicum, _Amber, Benzoin,
Sulphur, Antimony_, &c. (276, 277.)

_The thirty second_ Experiment, _That some Reds with Diluting turn Yellow,
others not, exemplify'd by the Tincture of_ Cochineel, _and by Balsam of_
Sulphur, _Tinctures of_ Amber, &c. (277, 278, 279.)

_The thirty third_ Experiment, _of a Red Tincture of_ Saccarum Saturni _and
Oyl of_ Turpentine _made by Digestion_ (279.)

_The thirty fourth_ Experiment, _of drawing a Volatile red Tincture of
Mercury_, _whose Steams were white, but it would Tinge the Skin black_