_The thirty ninth_ Experiment, _Of Varying the Decoction of_ Balaustiums _with Acid and Urinous Salts_ (294, 295.) _Some_ Annotations _wherein two_ Experiments _of_ Gassendus _are Related, Examined, and Improv'd_ (from 295 to 302.) _The fortieth_ Experiment, _Of the no less Strange than Pleasant changes made with a Solution of Sublimate_ (from 301 to 306.) _The difference between a Chymical axd Philosophical Solution of a_ Phænomenon (307, 308.) _The Authors Chymical Explication of the_ Phænomena, _confirm d by several_ Experiments _made on_ Mercury, _with several Saline Liquors_ (from 308 to 310.) _An Improvement of the fortieth_ Experiment, _by a fresh Decoction of_ Antimony _in a_ Lixivium (311, 312, 313.) _Reflections on the tenth, twentieth, and fortieth_ Experiments, _compar'd together, shewing a way with this Tincture of Sublimate to distinguish whether any Saline Body to be examin'd be of a Urinous or Alcalizate Nature_ (from 314 to 317.) _The Examination of Spirit of_ Sal-armoniack, _and Spirit of_ Oak _by these Principles_ (from 316 to 319.) _That the Author knows ways of making highly Operative Saline bodies, that produce none of the before mention'd effects_ (319, 320.) _Some notable_ Experiments _about Solutions and Precipitations of Gold and Silver_ (320, 321.) _The one and fortieth_ Experiment, _Of Depriving a deep Blew Solution of Copper of its Colour_ (322.) _to which is adjoyn'd the Discolouring or making Transparent a Solution of Verdigrease, &c. and another of Restoring or Increasing it_ (322, 323.) _The forty second_ Experiment, _Of changing a Milk white Precipitate of_ Mercury _into a Yellow, by Affusion of fair Water, with several Considerations thereon_ (from 323 to 326.) _The forty third_ Experiment, _Of Extracting a Green Solution with fair Water out of imperfectly Calcin'd Vitriol_ (327.) _The forty fourth_ Experiment, _Of the Deepning and Diluting of several Tinctures, by the Affusions of Liquors, and by Conical Glasses that contain'd them, Exemplify'd in the Tinctures of_ Cochineel, Brasil, Verdigrease, Glass, Litmus, _of which last on this occasion several pleasant_ Phænomena _are related_ (from 328 to 335.) _To which are adjoyn'd certain Cautional Corollaries_ (335, 336.) _The Waterdrinker and some of his Legerdemain tricks related._(337.) _The forty fifth_ Experiment, _Of the turning Rhenish and White Wine into a lovely Green, with a preparation of Steel _(338, 339.) _Some further Trial made about these Tinctures, and a Similar_ Experiment _of_ Olaus Wormius (340.) _The forty sixth_ Experiment, _Of the Internal Colour of Metalls exhibited by Calcination_ (341, 342, 343.) Annotation _the first, That several degrees of Fire may disclose a differing Colour_ (343.) Annotation _the second, That the Glasses of Metalls may exhibit also other Kinds of Colours_ (344.) Annotation _the third, That Minerals by several degrees of Fire may disclose several Colours_(345).